SEC Filing | Cabot Corporation

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SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* CABOT CORPORATION (Name of Issuer) COMMON STOCK, PAR VALUE $1.00 PER SHARE (Title of Class of Securities) 127055101 (CUSIP Number) SPO Advisory Corp. 591 Redwood Highway, Suite 3215 Mill Valley, California 94941 (415) 383-6600 with a copy to: Alison S. Ressler Sullivan & Cromwell LLP 1888 Century Park East Los Angeles, California 90067-1725 (310) 712-6600 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) AUGUST 18, 2005 (Date of Event which Requires Filing of This Statement) If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this Schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box |_|. Note. Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent. *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

Page 2 of 56 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Partners II, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 3,804,400 (1) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 3,804,400 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,804,400 (1) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, SPO Advisory Partners, L.P.

Page 3 of 56 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Advisory Partners, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 3,804,400 (1)(2) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 3,804,400 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,804,400 (1)(2) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.1% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of SPO Partners II, L.P. (2) Power is exercised through its sole general partner, SPO Advisory Corp.

Page 4 of 56 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON San Francisco Partners II, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION California - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 242,900 (1) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 242,900 (1) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 242,900 (1) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.4% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Power is exercised through its sole general partner, SF Advisory Partners, L.P.

Page 5 of 56 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SF Advisory Partners, L.P. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 242,900 (1)(2) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 242,900 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 242,900 (1)(2) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0.4% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON PN - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of San Francisco Partners II, L.P. (2) Power is exercised through its sole general partner, SPO Advisory Corp.

Page 6 of 56 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON SPO Advisory Corp. - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER 4,047,300 (1)(2) ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By -0- Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER 4,047,300 (1)(2) ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER -0- - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,047,300 (1)(2) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO - -------------------------------------------------------------------------------- (1) Solely in its capacity as the sole general partner of SPO Advisory Partners, L.P. with respect to 3,804,400 of such shares; and solely in its capacity as the sole general partner of SF Advisory Partners, L.P. with respect to 242,900 of such shares. (2) Power is exercised through its three controlling persons, John H. Scully, William E. Oberndorf and William J. Patterson.

Page 7 of 56 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON John H. Scully - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER -0- ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By 4,047,300 (1) Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 4,047,300 (1) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,047,300 (1) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) These shares may be deemed to be beneficially owned by Mr. Scully solely in his capacity as one of three controlling persons of SPO Advisory Corp.

Page 8 of 56 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON William E. Oberndorf - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER -0- ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By 4,047,300 (1) Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 4,047,300 (1) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,047,300 (1) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) These shares may be deemed to be beneficially owned by Mr. Oberndorf solely in his capacity as one of three controlling persons of SPO Advisory Corp.

Page 9 of 56 pages CUSIP No. 127055101 - -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSON William J. Patterson - -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: (a) |_| (b) |X| - -------------------------------------------------------------------------------- 3. SEC Use Only - -------------------------------------------------------------------------------- 4. SOURCE OF FUNDS Not Applicable - -------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(e) OR 2(f) |_| - -------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION USA - -------------------------------------------------------------------------------- 7. SOLE VOTING POWER -0- ------------------------------------------------------ Number Of Shares 8. SHARED VOTING POWER Beneficially Owned By 4,047,300 (1) Each Reporting Person ------------------------------------------------------ With 9. SOLE DISPOSITIVE POWER -0- ------------------------------------------------------ 10. SHARED DISPOSITIVE POWER 4,047,300 (1) - -------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,047,300 (1) - -------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES |_| - -------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 6.5% - -------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON IN - -------------------------------------------------------------------------------- (1) These shares may be deemed to be beneficially owned by Mr. Patterson solely in his capacity as one of three controlling persons of SPO Advisory Corp.

Page 10 of 56 pages ITEM 1. SECURITY AND ISSUER. This statement relates to the shares of Common Stock, par value $1.00 per share ("Shares"), of Cabot Corporation, a Delaware corporation (the "Issuer"). The principal executive offices of the Issuer are located at Two Seaport Lane, Boston, Massachusetts 02210. ITEM 2. IDENTITY AND BACKGROUND. (a) The undersigned hereby file this Schedule 13D Statement on behalf of SPO Partners II, L.P., a Delaware limited partnership ("SPO"), SPO Advisory Partners, L.P., a Delaware limited partnership ("SPO Advisory Partners"), San Francisco Partners II, L.P., a California limited partnership ("SFP"), SF Advisory Partners, L.P., a Delaware limited partnership ("SF Advisory Partners"), SPO Advisory Corp., a Delaware corporation ("SPO Advisory Corp."), John H. Scully ("JHS"), William E. Oberndorf ("WEO") and William J. Patterson ("WJP"). SPO, SPO Advisory Partners, SFP, SF Advisory Partners, SPO Advisory Corp., JHS, WEO and WJP are sometimes hereinafter referred to as the "Reporting Persons." The Reporting Persons are making this single, joint filing because they may be deemed to constitute a "group" within the meaning of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended (the "Act"), although neither the fact of this filing nor anything contained herein shall be deemed to be an admission by the Reporting Persons that a group exists. (b) - (c) SPO SPO is a Delaware limited partnership, the principal business of which is the purchase, sale, exchange, acquisition and holding of investment securities. The principal business address of SPO, which also serves as its principal office, is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. Pursuant to Instruction C to Schedule 13D of the Act, certain information with respect to SPO Advisory Partners, the sole general partner of SPO, is set forth below. SPO ADVISORY PARTNERS SPO Advisory Partners is a Delaware limited partnership, the principal business of which is serving as the sole general partner of SPO. The principal business address of SPO Advisory Partners, which also serves as its principal office, is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. Pursuant to Instruction C to Schedule 13D of the Act, certain information with respect to SPO Advisory Corp., the sole general partner of SPO Advisory Partners, is set forth below. SFP SFP is a California limited partnership, the principal business of which is the purchase, sale, exchange, acquisition and holding of investment securities. The principal business address of SFP, which also serves as its principal office, is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. Pursuant to Instruction C to Schedule 13D of the Act, certain information with respect to SF Advisory Partners, the sole general partner of SFP, is set forth below. SF ADVISORY PARTNERS SF Advisory Partners is a Delaware limited partnership, the principal business of which is serving as the sole general partner of SFP. The principal business address of SF Advisory Partners,

Page 11 of 56 pages which also serves as its principal office, is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. Pursuant to Instruction C to Schedule 13D of the Act, certain information with respect to SPO Advisory Corp., the sole general partner of SF Advisory Partners, is set forth below. SPO ADVISORY CORP. SPO Advisory Corp. is a Delaware corporation, the principal business of which is serving as the sole general partner of each of SPO Advisory Partners and SF Advisory Partners. The principal business address of SPO Advisory Corp., which also serves as its principal office, is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. Pursuant to Instruction C to Schedule 13D of the Act, certain information with respect to JHS, WEO and WJP, the three controlling persons of SPO Advisory Corp., is set forth below. JHS JHS' business address is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. His present principal occupation is serving as a managing director of SPO Partners & Co., a Delaware corporation. The principal business of SPO Partners & Co. is operating as an investment firm. The principal business address of SPO Partners & Co., which serves as its principal office, is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. JHS is one of three controlling persons of SPO Advisory Corp., the sole general partner of each of SPO Advisory Partners and SF Advisory Partners. WEO WEO's business address is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. His present principal occupation is serving as a managing director of SPO Partners & Co. WEO is one of three controlling persons of SPO Advisory Corp., the sole general partner of SPO Advisory Partners and SF Advisory Partners. WJP WJP's business address is 591 Redwood Highway, Suite 3215, Mill Valley, California 94941. His present principal occupation is serving as a managing director of SPO Partners & Co. WJP is one of three controlling persons of SPO Advisory Corp., the sole general partner of SPO Advisory Partners and SF Advisory Partners. (d) None of the entities or persons identified in this Item 2 has, during the last five years, been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors). (e) None of the entities or persons identified in this Item 2 has, during the last five years, been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. (f) All of the natural persons identified in this Item 2 are citizens of the United States of America.

Page 12 of 56 pages ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION. The source and amount of the funds used or to be used by the Reporting Persons to purchase Shares are as follows: NAME SOURCE OF FUNDS AMOUNT OF FUNDS - --------------------- --------------------------- --------------- SPO Contributions from Partners $123,143,758 SPO Advisory Partners Not Applicable Not Applicable SFP Contributions from Partners $7,862,356 SF Advisory Partners Not Applicable Not Applicable SPO Advisory Corp. Not Applicable Not Applicable JHS Not Applicable Not Applicable WEO Not Applicable Not Applicable WJP Not Applicable Not Applicable ITEM 4. PURPOSE OF TRANSACTION. The Reporting Persons have acquired the Shares reported herein for investment purposes. Consistent with such purpose, the Reporting Persons have had, and may have in the future, discussions with management of the Issuer and may make suggestions concerning the Issuer's operations, prospects, business and financial strategies, assets and liabilities, business and financing alternatives and such other matters as the Reporting Persons may deem relevant to their investments in the Shares and other securities of the Issuer. Each Reporting Person expects that it will, from time to time, review its investment position in the Issuer and may, depending on market and other conditions, increase or decrease its investment position in the Shares or other securities of the Issuer. Whether the Reporting Persons purchase any additional Shares or other securities of the Issuer or dispose of any Shares or other securities of the Issuer, and the amount and timing of any such transactions, will depend upon the Reporting Persons' individual continuing assessments of pertinent factors, including the availability of Shares or other securities of the Issuer for purchase at particular price levels, the Issuer's and the particular Reporting Person's business and prospects, other business investment opportunities available to the particular Reporting Person, economic conditions, stock market conditions, money market conditions, the attitudes and actions of the Board of Directors and management of the Issuer, the availability and nature of opportunities to dispose of the particular Reporting Person's interest in the Issuer, to realize trading profits or minimize trading losses, and other plans and requirements of the particular Reporting Person. Depending upon its individual assessments of these factors from time to time, each Reporting Person may change its present intentions as stated above, including determining to acquire additional Shares or other securities of the Issuer (by means of open market or privately negotiated purchases) or to dispose of some or all of the Shares or other securities of the Issuer held by or under the control of such Reporting Person. In addition, each Reporting Person may from time to time enter into equity swap or other derivative transactions with respect to its investment in the Shares or other securities of the Issuer. Except as set forth in this Item 4, the Reporting Persons have no present plans or proposals that relate to or that would result in any of the actions specified in clauses (a) through (j) of Item 4 of Schedule 13D of the Act.

Page 13 of 56 pages ITEM 5. INTEREST IN SECURITIES OF THE ISSUER. (a) Percentage interest calculations for each Reporting Person are based upon the Issuer having 62,030,447 total outstanding shares of Common Stock as reported on the Issuer's 10-Q filed with the Securities and Exchange Commission on August 9, 2005. SPO The aggregate number of Shares that SPO owns beneficially, pursuant to Rule 13d-3 of the Act, is 3,804,400 Shares, which constitutes approximately 6.1% of the outstanding Shares. SPO Advisory Partners Because of its position as the sole general partner of SPO, SPO Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 3,804,400 Shares, which constitutes approximately 6.1% of the outstanding Shares. SFP The aggregate number of Shares that SFP owns beneficially, pursuant to Rule 13d-3 of the Act, is 242,900 Shares, which constitutes approximately 0.4% of the outstanding Shares. SF Advisory Partners Because of its position as the sole general partner of SFP, SF Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 242,900 Shares, which constitutes approximately 0.4% of the outstanding Shares. SPO Advisory Corp. Because of its positions as the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, SPO Advisory Corp. may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 4,047,300 Shares in the aggregate, which constitutes approximately 6.5% of the outstanding Shares. JHS Because of his position as a control person of SPO Advisory Corp., JHS may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 4,047,300 Shares, which constitutes approximately 6.5% of the outstanding Shares. WEO Because of his position as a control person of SPO Advisory Corp., WEO may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 4,047,300 Shares, which constitutes approximately 6.5% of the outstanding Shares.

Page 14 of 56 pages WJP Because of his position as a control person of SPO Advisory Corp., WJP may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of 4,047,300 Shares, which constitutes approximately 6.5% of the outstanding Shares. To the best of the knowledge of each of the Reporting Persons, other than as set forth above, none of the persons named in Item 2 hereof is the beneficial owner of any Shares. (b) SPO Acting through its sole general partner, SPO has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 3,804,400 Shares. SPO Advisory Partners Acting through its sole general partner and in its capacity as the sole general partner of SPO, SPO Advisory Partners has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 3,804,400 Shares. SFP Acting through its sole general partner, SFP has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 242,900 Shares. SF Advisory Partners Acting through its sole general partner and in its capacity as the sole general partner of SFP, SF Advisory Partners has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 242,900 Shares. SPO Advisory Corp. Acting through its controlling persons and in its capacities as the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, SPO Advisory Corp. has the sole power to vote or to direct the vote and to dispose or to direct the disposition of 4,047,300 Shares in the aggregate. JHS As one of three controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, JHS may be deemed to have shared power with WEO and WJP to vote or to direct the vote and to dispose or to direct the disposition of 4,047,300 Shares held by SPO and SFP in the aggregate. WEO As one of three controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, WEO may be deemed to have shared power with JHS and WJP to vote or to direct the vote and to dispose or to direct the disposition of 4,047,300 Shares held by SPO and SFP in the aggregate.

Page 15 of 56 pages WJP As one of three controlling persons of SPO Advisory Corp., which is the sole general partner of each of SPO Advisory Partners and SF Advisory Partners, WJP may be deemed to have shared power with JHS and WEO to vote or to direct the vote and to dispose or to direct the disposition of 4,047,300 Shares held by SPO and SFP in the aggregate. (c) Within the past 60 days of the date of this statement, Reporting Persons purchased Shares in open market transactions as set forth on Schedule I attached hereto. Except as set forth in this paragraph (c), to the best of the knowledge of each of the Reporting Persons, none of the persons named in response to paragraph (a) has effected any transactions in Shares during the past 60 days. (d) Each of the Reporting Persons affirms that no person other than such Reporting Person has the right to receive or the power to direct the receipt of distributions with respect to, or the proceeds from the sale of, Shares owned by such Reporting Person. (e) Not applicable. ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO SECURITIES OF THE ISSUER. Except as set forth herein or in the Exhibits filed herewith, there are no other contracts, arrangements, understandings or relationships of the type required to be disclosed in response to Item 6 of Schedule 13D of the Act with respect to the Shares owned by the Reporting Persons. ITEM 7. MATERIAL TO BE FILED AS EXHIBITS. Exhibit A: Agreement pursuant to Rule 13d-1 (k) Exhibit B: Power of Attorney

Page 16 of 56 pages SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated August 29, 2005 By: /s/ Kim M. Silva -------------------------------- Kim M. Silva Attorney-in-Fact for: SPO PARTNERS II, L.P.(1) SPO ADVISORY PARTNERS, L.P.(1) SAN FRANCISCO PARTNERS II, L.P.(1) SF ADVISORY PARTNERS, L.P.(1) SPO ADVISORY CORP.(1) JOHN H. SCULLY(1) WILLIAM E. OBERNDORF(1) WILLIAM J. PATTERSON(1) (1) A Power of Attorney authorizing Kim M. Silva to act on behalf of this person or entity is filed as Exhibit B.

Page 17 of 56 pages SCHEDULE I TO SCHEDULE 13D FOR SPO PARTNERS II, L.P. Pages 17 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 6/27/2005 Buy 4,700 31.35 Open Market/Broker San Francisco Partners, L.P. 6/27/2005 Buy 300 31.35 Open Market/Broker SPO Partners II, L.P. 6/28/2005 Buy 24,100 32.09 Open Market/Broker San Francisco Partners, L.P. 6/28/2005 Buy 1,600 32.09 Open Market/Broker SPO Partners II, L.P. 6/29/2005 Buy 77,000 33.19 Open Market/Broker San Francisco Partners, L.P. 6/29/2005 Buy 4,900 33.19 Open Market/Broker SPO Partners II, L.P. 6/30/2005 Buy 81,800 33.08 Open Market/Broker San Francisco Partners, L.P. 6/30/2005 Buy 5,200 33.08 Open Market/Broker SPO Partners II, L.P. 7/1/2005 Buy 48,400 33.01 Open Market/Broker San Francisco Partners, L.P. 7/1/2005 Buy 3,100 33.01 Open Market/Broker SPO Partners II, L.P. 7/5/2005 Buy 141,000 33.02 Open Market/Broker San Francisco Partners, L.P. 7/5/2005 Buy 9,000 33.02 Open Market/Broker SPO Partners II, L.P. 7/6/2005 Buy 84,600 33.04 Open Market/Broker San Francisco Partners, L.P. 7/6/2005 Buy 5,400 33.04 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 4,700 32.99 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 58,562 33.00 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 4,512 33.01 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 2,914 33.02 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 4,512 33.03 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 564 33.04 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 4,230 33.05 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 94 33.06 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 846 33.07 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 376 33.08 Open Market/Broker SPO Partners II, L.P. 7/7/2005 Buy 84,882 33.09 Open Market/Broker

Pages 18 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 7/7/2005 Buy 608 33.10 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 300 32.99 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 3,738 33.00 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 288 33.01 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 186 33.02 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 288 33.03 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 36 33.04 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 270 33.05 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 6 33.06 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 54 33.07 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 24 33.08 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 5,418 33.09 Open Market/Broker San Francisco Partners, L.P. 7/7/2005 Buy 92 33.10 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 27,636 33.00 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 470 33.02 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 1,504 33.03 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 4,794 33.04 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 42,018 33.05 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 1,128 33.06 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 94 33.07 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 564 33.08 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 1,222 33.09 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 1,128 33.10 Open Market/Broker SPO Partners II, L.P. 7/8/2005 Buy 37,642 33.25 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 1,764 33.00 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 30 33.02 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 96 33.03 Open Market/Broker

Pages 19 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 7/8/2005 Buy 306 33.04 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 2,682 33.05 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 72 33.06 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 6 33.07 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 36 33.08 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 78 33.09 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 72 33.10 Open Market/Broker San Francisco Partners, L.P. 7/8/2005 Buy 2,358 33.25 Open Market/Broker SPO Partners II, L.P. 7/14/2005 Buy 188 34.15 Open Market/Broker SPO Partners II, L.P. 7/14/2005 Buy 282 34.34 Open Market/Broker SPO Partners II, L.P. 7/14/2005 Buy 94 34.35 Open Market/Broker SPO Partners II, L.P. 7/14/2005 Buy 94 34.37 Open Market/Broker SPO Partners II, L.P. 7/14/2005 Buy 3,196 34.38 Open Market/Broker SPO Partners II, L.P. 7/14/2005 Buy 658 34.39 Open Market/Broker SPO Partners II, L.P. 7/14/2005 Buy 10,688 34.40 Open Market/Broker San Francisco Partners, L.P. 7/14/2005 Buy 12 34.15 Open Market/Broker San Francisco Partners, L.P. 7/14/2005 Buy 18 34.34 Open Market/Broker San Francisco Partners, L.P. 7/14/2005 Buy 6 34.35 Open Market/Broker San Francisco Partners, L.P. 7/14/2005 Buy 6 34.37 Open Market/Broker San Francisco Partners, L.P. 7/14/2005 Buy 204 34.38 Open Market/Broker San Francisco Partners, L.P. 7/14/2005 Buy 42 34.39 Open Market/Broker San Francisco Partners, L.P. 7/14/2005 Buy 712 34.40 Open Market/Broker SPO Partners II, L.P. 7/18/2005 Buy 752 34.25 Open Market/Broker SPO Partners II, L.P. 7/18/2005 Buy 94 34.49 Open Market/Broker SPO Partners II, L.P. 7/18/2005 Buy 103,354 34.50 Open Market/Broker San Francisco Partners, L.P. 7/18/2005 Buy 48 34.25 Open Market/Broker San Francisco Partners, L.P. 7/18/2005 Buy 6 34.49 Open Market/Broker

Pages 20 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 7/18/2005 Buy 6,546 34.50 Open Market/Broker SPO Partners II, L.P. 7/19/2005 Buy 47,000 34.50 Open Market/Broker San Francisco Partners, L.P. 7/19/2005 Buy 3,000 34.50 Open Market/Broker SPO Partners II, L.P. 7/28/2005 Buy 282 34.15 Open Market/Broker SPO Partners II, L.P. 7/28/2005 Buy 618 34.16 Open Market/Broker San Francisco Partners, L.P. 7/28/2005 Buy 18 34.15 Open Market/Broker San Francisco Partners, L.P. 7/28/2005 Buy 82 34.16 Open Market/Broker SPO Partners II, L.P. 7/29/2005 Buy 85,200 34.50 Open Market/Broker San Francisco Partners, L.P. 7/29/2005 Buy 5,400 34.50 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 188 34.05 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,504 34.06 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,222 34.07 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 752 34.08 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 846 34.09 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 188 34.10 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,128 34.11 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,128 34.12 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 752 34.13 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 658 34.14 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,410 34.15 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,598 34.16 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,410 34.17 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 940 34.18 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 2,256 34.19 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,692 34.20 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,316 34.21 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,034 34.22 Open Market/Broker

Pages 21 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/2/2005 Buy 282 34.23 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 564 34.24 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 1,316 34.25 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 94 34.26 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 94 34.27 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 94 34.28 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 282 34.29 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 964 34.30 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 94 34.31 Open Market/Broker SPO Partners II, L.P. 8/2/2005 Buy 94 34.33 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 12 34.05 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 96 34.06 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 78 34.07 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 48 34.08 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 54 34.09 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 12 34.10 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 72 34.11 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 72 34.12 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 48 34.13 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 42 34.14 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 90 34.15 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 102 34.16 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 90 34.17 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 60 34.18 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 144 34.19 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 108 34.20 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 84 34.21 Open Market/Broker

Pages 22 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/2/2005 Buy 66 34.22 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 18 34.23 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 36 34.24 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 84 34.25 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 6 34.26 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 6 34.27 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 6 34.28 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 18 34.29 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 36 34.30 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 6 34.31 Open Market/Broker San Francisco Partners, L.P. 8/2/2005 Buy 6 34.33 Open Market/Broker SPO Partners II, L.P. 8/3/2005 Buy 94 34.14 Open Market/Broker SPO Partners II, L.P. 8/3/2005 Buy 282 34.15 Open Market/Broker SPO Partners II, L.P. 8/3/2005 Buy 564 34.16 Open Market/Broker SPO Partners II, L.P. 8/3/2005 Buy 1,880 34.17 Open Market/Broker SPO Partners II, L.P. 8/3/2005 Buy 2,256 34.18 Open Market/Broker SPO Partners II, L.P. 8/3/2005 Buy 3,008 34.19 Open Market/Broker SPO Partners II, L.P. 8/3/2005 Buy 5,916 34.20 Open Market/Broker San Francisco Partners, L.P. 8/3/2005 Buy 6 34.14 Open Market/Broker San Francisco Partners, L.P. 8/3/2005 Buy 18 34.15 Open Market/Broker San Francisco Partners, L.P. 8/3/2005 Buy 36 34.16 Open Market/Broker San Francisco Partners, L.P. 8/3/2005 Buy 120 34.17 Open Market/Broker San Francisco Partners, L.P. 8/3/2005 Buy 144 34.18 Open Market/Broker San Francisco Partners, L.P. 8/3/2005 Buy 192 34.19 Open Market/Broker San Francisco Partners, L.P. 8/3/2005 Buy 384 34.20 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 282 33.84 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 564 33.85 Open Market/Broker

Pages 23 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/4/2005 Buy 1,316 33.86 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 282 33.87 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 2,068 33.88 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 2,538 33.89 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 2,726 33.90 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 564 33.91 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 564 33.92 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 470 33.93 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 940 33.94 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 846 33.95 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 376 33.96 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 658 33.97 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 658 33.98 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 94 33.99 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 282 34.00 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 1,504 34.01 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 1,692 34.02 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 470 34.03 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 658 34.04 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 658 34.05 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 188 34.06 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 94 34.07 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 674 34.08 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 188 34.09 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 188 34.10 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 94 34.11 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 188 34.12 Open Market/Broker

Pages 24 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/4/2005 Buy 94 34.13 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 94 34.15 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 94 34.18 Open Market/Broker SPO Partners II, L.P. 8/4/2005 Buy 94 34.19 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 18 33.84 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 36 33.85 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 84 33.86 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 18 33.87 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 132 33.88 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 162 33.89 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 174 33.90 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 36 33.91 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 36 33.92 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 30 33.93 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 60 33.94 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 54 33.95 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 24 33.96 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 42 33.97 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 42 33.98 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 6 33.99 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 18 34.00 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 96 34.01 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 108 34.02 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 30 34.03 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 42 34.04 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 42 34.05 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 12 34.06 Open Market/Broker

Pages 25 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/4/2005 Buy 6 34.07 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 26 34.08 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 12 34.09 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 12 34.10 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 6 34.11 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 12 34.12 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 6 34.13 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 6 34.15 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 6 34.18 Open Market/Broker San Francisco Partners, L.P. 8/4/2005 Buy 6 34.19 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 940 33.82 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 94 33.83 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 564 33.85 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 940 33.86 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 1,410 33.87 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 1,128 33.88 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 470 33.89 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 1,034 33.90 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 1,034 33.91 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 3,102 33.92 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 846 33.93 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 940 33.94 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 752 33.95 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 658 33.96 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 846 33.97 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 1,410 33.98 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 940 33.99 Open Market/Broker

Pages 26 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/5/2005 Buy 376 34.00 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 282 34.01 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 94 34.02 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 94 34.09 Open Market/Broker SPO Partners II, L.P. 8/5/2005 Buy 46 34.11 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 60 33.82 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 6 33.83 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 36 33.85 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 60 33.86 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 90 33.87 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 72 33.88 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 30 33.89 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 66 33.90 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 66 33.91 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 198 33.92 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 54 33.93 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 60 33.94 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 48 33.95 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 42 33.96 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 54 33.97 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 90 33.98 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 60 33.99 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 24 34.00 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 18 34.01 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 6 34.02 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 6 34.09 Open Market/Broker San Francisco Partners, L.P. 8/5/2005 Buy 54 34.11 Open Market/Broker

Pages 27 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/8/2005 Buy 1,222 33.80 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 1,692 33.81 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 846 33.82 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 3,102 33.83 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 1,692 33.84 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 752 33.85 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 1,410 33.86 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 1,316 33.87 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 1,222 33.88 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 940 33.89 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 5,734 33.90 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 1,692 33.91 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 2,068 33.92 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 658 33.93 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 376 33.94 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 752 33.95 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 752 33.96 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 564 33.97 Open Market/Broker SPO Partners II, L.P. 8/8/2005 Buy 1,210 33.98 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 78 33.80 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 108 33.81 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 54 33.82 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 198 33.83 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 108 33.84 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 48 33.85 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 90 33.86 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 84 33.87 Open Market/Broker

Pages 28 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/8/2005 Buy 78 33.88 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 60 33.89 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 366 33.90 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 108 33.91 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 132 33.92 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 42 33.93 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 24 33.94 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 48 33.95 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 48 33.96 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 36 33.97 Open Market/Broker San Francisco Partners, L.P. 8/8/2005 Buy 90 33.98 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 94 33.82 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 188 33.83 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 188 33.84 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 564 33.85 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 1,034 33.86 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 376 33.87 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 188 33.88 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 658 33.89 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 658 33.90 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 376 33.91 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 940 33.92 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 846 33.93 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 470 33.94 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 564 33.95 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 846 33.96 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 564 33.97 Open Market/Broker

Pages 29 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/9/2005 Buy 752 33.98 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 1,692 33.99 Open Market/Broker SPO Partners II, L.P. 8/9/2005 Buy 8,802 34.00 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 6 33.82 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 12 33.83 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 12 33.84 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 36 33.85 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 66 33.86 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 24 33.87 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 12 33.88 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 42 33.89 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 42 33.90 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 24 33.91 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 60 33.92 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 54 33.93 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 30 33.94 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 36 33.95 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 54 33.96 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 36 33.97 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 48 33.98 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 108 33.99 Open Market/Broker San Francisco Partners, L.P. 8/9/2005 Buy 598 34.00 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 94 33.81 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 94 33.82 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 94 33.83 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 94 33.84 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 1,222 33.85 Open Market/Broker

Pages 30 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/10/2005 Buy 94 33.86 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 94 33.87 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 94 33.88 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 470 33.89 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 94 33.90 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 470 33.91 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 376 33.92 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 658 33.93 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 1,410 33.94 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 658 33.95 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 282 33.96 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 1,222 33.97 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 1,034 33.98 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 376 33.99 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 4,042 34.00 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 752 34.01 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 1,880 34.02 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 1,786 34.03 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 2,538 34.04 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 2,538 34.05 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 2,068 34.06 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 2,162 34.07 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 3,854 34.08 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 4,324 34.09 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 4,324 34.10 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 376 34.11 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 282 34.12 Open Market/Broker

Pages 31 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/10/2005 Buy 470 34.13 Open Market/Broker SPO Partners II, L.P. 8/10/2005 Buy 174 34.14 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 6 33.81 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 6 33.82 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 6 33.83 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 6 33.84 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 78 33.85 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 6 33.86 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 6 33.87 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 6 33.88 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 30 33.89 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 6 33.90 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 30 33.91 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 24 33.92 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 42 33.93 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 90 33.94 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 42 33.95 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 18 33.96 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 78 33.97 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 66 33.98 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 24 33.99 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 258 34.00 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 48 34.01 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 120 34.02 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 114 34.03 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 162 34.04 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 162 34.05 Open Market/Broker

Pages 32 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/10/2005 Buy 132 34.06 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 138 34.07 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 246 34.08 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 276 34.09 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 276 34.10 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 24 34.11 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 18 34.12 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 30 34.13 Open Market/Broker San Francisco Partners, L.P. 8/10/2005 Buy 26 34.14 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 564 33.93 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 94 33.98 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 94 34.06 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 188 34.07 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 940 34.08 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 188 34.09 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,034 34.10 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 564 34.11 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 940 34.12 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 658 34.13 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 376 34.14 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 658 34.15 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 188 34.16 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,034 34.17 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,034 34.18 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 752 34.19 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 752 34.20 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,692 34.21 Open Market/Broker

Pages 33 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/11/2005 Buy 1,504 34.22 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,504 34.23 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 940 34.24 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 564 34.25 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 188 34.26 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 282 34.27 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,410 34.28 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,504 34.29 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,128 34.30 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 188 34.31 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 658 34.32 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,222 34.33 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,222 34.34 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,128 34.36 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 564 34.37 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,034 34.38 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 376 34.39 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 13,348 34.40 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 470 34.41 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 564 34.42 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 658 34.43 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 2,820 34.45 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 282 34.46 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 3,854 34.47 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 1,222 34.48 Open Market/Broker SPO Partners II, L.P. 8/11/2005 Buy 2,016 34.49 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 36 33.93 Open Market/Broker

Pages 34 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/11/2005 Buy 6 33.98 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 6 34.06 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 12 34.07 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 60 34.08 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 12 34.09 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 66 34.10 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 36 34.11 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 60 34.12 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 42 34.13 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 24 34.14 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 42 34.15 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 12 34.16 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 66 34.17 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 66 34.18 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 48 34.19 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 48 34.20 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 108 34.21 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 96 34.22 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 96 34.23 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 60 34.24 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 36 34.25 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 12 34.26 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 18 34.27 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 90 34.28 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 96 34.29 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 72 34.30 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 12 34.31 Open Market/Broker

Pages 35 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/11/2005 Buy 42 34.32 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 78 34.33 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 78 34.34 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 72 34.36 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 36 34.37 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 66 34.38 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 24 34.39 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 852 34.40 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 30 34.41 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 36 34.42 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 42 34.43 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 180 34.45 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 18 34.46 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 246 34.47 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 78 34.48 Open Market/Broker San Francisco Partners, L.P. 8/11/2005 Buy 84 34.49 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 94 33.80 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,222 33.82 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 470 33.83 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 752 33.84 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 470 33.85 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 564 33.86 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 846 33.87 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 846 33.88 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 282 33.89 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 470 33.90 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 94 33.91 Open Market/Broker

Pages 36 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/12/2005 Buy 1,222 33.92 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,222 33.93 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,034 33.94 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,316 33.95 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,410 33.96 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,316 33.97 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 3,572 33.98 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 2,914 33.99 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 2,444 34.00 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 846 34.01 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 846 34.02 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 376 34.03 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,222 34.05 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,598 34.06 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 188 34.07 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 1,974 34.08 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 188 34.10 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 94 34.11 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 94 34.12 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 282 34.14 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 94 34.15 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 94 34.16 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 282 34.17 Open Market/Broker SPO Partners II, L.P. 8/12/2005 Buy 662 34.20 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 6 33.80 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 78 33.82 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 30 33.83 Open Market/Broker

Pages 37 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/12/2005 Buy 48 33.84 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 30 33.85 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 36 33.86 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 54 33.87 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 54 33.88 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 18 33.89 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 30 33.90 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 6 33.91 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 78 33.92 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 78 33.93 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 66 33.94 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 84 33.95 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 90 33.96 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 84 33.97 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 228 33.98 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 186 33.99 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 156 34.00 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 54 34.01 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 54 34.02 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 24 34.03 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 78 34.05 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 102 34.06 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 12 34.07 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 126 34.08 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 12 34.10 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 6 34.11 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 6 34.12 Open Market/Broker

Pages 38 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/12/2005 Buy 18 34.14 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 6 34.15 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 6 34.16 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 18 34.17 Open Market/Broker San Francisco Partners, L.P. 8/12/2005 Buy 38 34.20 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 282 33.76 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 282 33.77 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 188 33.78 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 94 33.80 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 940 33.81 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,410 33.82 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 470 33.83 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,034 33.84 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 2,538 33.85 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 188 33.86 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,034 33.87 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,410 33.88 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,316 33.89 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,692 33.90 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,222 33.91 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,128 33.92 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 658 33.93 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 188 33.94 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 376 33.95 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 470 33.96 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 752 33.97 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,128 33.98 Open Market/Broker

Pages 39 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/15/2005 Buy 846 33.99 Open Market/Broker SPO Partners II, L.P. 8/15/2005 Buy 1,854 34.00 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 18 33.76 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 18 33.77 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 12 33.78 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 6 33.80 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 60 33.81 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 90 33.82 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 30 33.83 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 66 33.84 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 162 33.85 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 12 33.86 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 66 33.87 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 90 33.88 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 84 33.89 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 108 33.90 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 78 33.91 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 72 33.92 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 42 33.93 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 12 33.94 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 24 33.95 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 30 33.96 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 48 33.97 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 72 33.98 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 54 33.99 Open Market/Broker San Francisco Partners, L.P. 8/15/2005 Buy 146 34.00 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.29 Open Market/Broker

Pages 40 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/16/2005 Buy 846 33.30 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 282 33.31 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 1,128 33.32 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 9,870 33.33 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 564 33.34 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 940 33.35 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.36 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.37 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.44 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.45 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 376 33.46 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 846 33.50 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 11,750 33.51 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 2,632 33.52 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 4,700 33.53 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 6,674 33.54 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 4,230 33.55 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 752 33.56 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 188 33.57 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.59 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 658 33.60 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 564 33.61 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 564 33.62 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 470 33.63 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 1,222 33.64 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 1,034 33.65 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 940 33.66 Open Market/Broker

Pages 41 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/16/2005 Buy 376 33.67 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 1,410 33.68 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 564 33.69 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 940 33.70 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 846 33.71 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.73 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 564 33.75 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 4,982 33.76 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 2,162 33.77 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 282 33.78 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 1,222 33.79 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 188 33.80 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 3,196 33.81 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 2,444 33.82 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 470 33.83 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 282 33.84 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 564 33.85 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 564 33.86 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 376 33.87 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 564 33.88 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 1,410 33.89 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 1,034 33.90 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 470 33.91 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 940 33.92 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.94 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 874 33.95 Open Market/Broker SPO Partners II, L.P. 8/16/2005 Buy 94 33.96 Open Market/Broker

Pages 42 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/16/2005 Buy 6 33.29 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 54 33.30 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 18 33.31 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 72 33.32 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 630 33.33 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 36 33.34 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 60 33.35 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 6 33.36 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 6 33.37 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 6 33.44 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 6 33.45 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 24 33.46 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 54 33.50 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 750 33.51 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 168 33.52 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 300 33.53 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 426 33.54 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 270 33.55 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 48 33.56 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 12 33.57 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 6 33.59 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 42 33.60 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 36 33.61 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 36 33.62 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 30 33.63 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 78 33.64 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 66 33.65 Open Market/Broker

Pages 43 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/16/2005 Buy 60 33.66 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 24 33.67 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 90 33.68 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 36 33.69 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 60 33.70 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 54 33.71 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 6 33.73 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 36 33.75 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 318 33.76 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 138 33.77 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 18 33.78 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 78 33.79 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 12 33.80 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 204 33.81 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 156 33.82 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 30 33.83 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 18 33.84 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 36 33.85 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 36 33.86 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 24 33.87 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 36 33.88 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 90 33.89 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 66 33.90 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 30 33.91 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 60 33.92 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 6 33.94 Open Market/Broker San Francisco Partners, L.P. 8/16/2005 Buy 26 33.95 Open Market/Broker

Pages 44 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/16/2005 Buy 6 33.96 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 470 33.29 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 94 33.30 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 282 33.60 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 1,128 33.61 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 33.68 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 33.69 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 94 33.79 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 33.80 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 1,034 33.82 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 470 33.83 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 94 33.84 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 1,034 33.85 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 2,068 33.86 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 1,504 33.87 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 658 33.88 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 282 33.89 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 470 33.90 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 376 33.91 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 2,820 33.92 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 940 33.93 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 752 33.94 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 33.95 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 940 33.96 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 1,222 33.97 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 846 33.98 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 2,068 33.99 Open Market/Broker

Pages 45 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/17/2005 Buy 5,452 34.00 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 34.01 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 34.05 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 34.10 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 34.11 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 376 34.15 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 376 34.16 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 34.18 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 282 34.19 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 564 34.20 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 564 34.25 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 658 34.27 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 376 34.28 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 470 34.29 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 564 34.33 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 470 34.34 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 34.35 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 282 34.36 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 188 34.37 Open Market/Broker SPO Partners II, L.P. 8/17/2005 Buy 152 34.38 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 30 33.29 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 6 33.30 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 18 33.60 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 72 33.61 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 33.68 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 33.69 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 6 33.79 Open Market/Broker

Pages 46 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/17/2005 Buy 12 33.80 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 66 33.82 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 30 33.83 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 6 33.84 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 66 33.85 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 132 33.86 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 96 33.87 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 42 33.88 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 18 33.89 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 30 33.90 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 24 33.91 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 180 33.92 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 60 33.93 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 48 33.94 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 33.95 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 60 33.96 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 78 33.97 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 54 33.98 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 132 33.99 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 348 34.00 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 34.01 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 34.05 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 34.10 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 34.11 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 24 34.15 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 24 34.16 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 34.18 Open Market/Broker

Pages 47 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/17/2005 Buy 18 34.19 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 36 34.20 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 36 34.25 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 42 34.27 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 24 34.28 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 30 34.29 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 36 34.33 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 30 34.34 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 34.35 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 18 34.36 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 12 34.37 Open Market/Broker San Francisco Partners, L.P. 8/17/2005 Buy 48 34.38 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 470,752 33.77 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 470 33.79 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 23,500 33.83 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 94 33.85 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 470 33.86 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 658 33.91 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 752 33.92 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 940 33.93 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 752 33.96 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 564 33.98 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 564 33.99 Open Market/Broker SPO Partners II, L.P. 8/18/2005 Buy 6,984 34.00 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 30,048 33.77 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 30 33.79 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 1,500 33.83 Open Market/Broker

Pages 48 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/18/2005 Buy 6 33.85 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 30 33.86 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 42 33.91 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 48 33.92 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 60 33.93 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 48 33.96 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 36 33.98 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 36 33.99 Open Market/Broker San Francisco Partners, L.P. 8/18/2005 Buy 416 34.00 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 188 33.37 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 94 33.42 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 282 33.45 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 94 33.48 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 1,504 33.49 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 6,580 33.50 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 4,324 33.51 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 6,110 33.52 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 3,666 33.53 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 2,350 33.54 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 3,102 33.55 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 376 33.56 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 1,128 33.57 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 1,504 33.58 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 752 33.59 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 2,162 33.60 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 564 33.61 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 1,974 33.62 Open Market/Broker

Pages 49 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/19/2005 Buy 1,598 33.63 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 94 33.64 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 2,444 33.65 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 188 33.66 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 752 33.68 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 376 33.69 Open Market/Broker SPO Partners II, L.P. 8/19/2005 Buy 294 33.70 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 12 33.37 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 6 33.42 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 18 33.45 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 6 33.48 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 96 33.49 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 420 33.50 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 276 33.51 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 390 33.52 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 234 33.53 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 150 33.54 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 198 33.55 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 24 33.56 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 72 33.57 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 96 33.58 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 48 33.59 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 138 33.60 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 36 33.61 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 126 33.62 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 102 33.63 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 6 33.64 Open Market/Broker

Pages 50 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/19/2005 Buy 156 33.65 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 12 33.66 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 48 33.68 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 24 33.69 Open Market/Broker San Francisco Partners, L.P. 8/19/2005 Buy 6 33.70 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 94 33.44 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 470 33.45 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 188 33.46 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 658 33.47 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 1,128 33.48 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 846 33.49 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 441,270 33.50 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 564 33.51 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 752 33.52 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 658 33.53 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 94 33.54 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 376 33.55 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 94 33.56 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 188 33.57 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 940 33.59 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 282 33.60 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 564 33.61 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 376 33.62 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 282 33.67 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 94 33.68 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 4,136 33.69 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 94 33.70 Open Market/Broker

Pages 51 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/22/2005 Buy 470 33.71 Open Market/Broker SPO Partners II, L.P. 8/22/2005 Buy 282 33.72 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 6 33.44 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 30 33.45 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 12 33.46 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 42 33.47 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 72 33.48 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 54 33.49 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 28,130 33.50 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 36 33.51 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 48 33.52 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 42 33.53 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 6 33.54 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 24 33.55 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 6 33.56 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 12 33.57 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 60 33.59 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 18 33.60 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 36 33.61 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 24 33.62 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 18 33.67 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 6 33.68 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 264 33.69 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 6 33.70 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 30 33.71 Open Market/Broker San Francisco Partners, L.P. 8/22/2005 Buy 18 33.72 Open Market/Broker

Pages 52 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/24/2005 Buy 1,034 33.09 Open Market/Broker SPO Partners II, L.P. 8/24/2005 Buy 217,798 33.10 Open Market/Broker SPO Partners II, L.P. 8/24/2005 Buy 23,970 33.12 Open Market/Broker SPO Partners II, L.P. 8/24/2005 Buy 752 33.13 Open Market/Broker SPO Partners II, L.P. 8/24/2005 Buy 752 33.14 Open Market/Broker SPO Partners II, L.P. 8/24/2005 Buy 1,128 33.15 Open Market/Broker SPO Partners II, L.P. 8/24/2005 Buy 470 33.24 Open Market/Broker SPO Partners II, L.P. 8/24/2005 Buy 752 33.28 Open Market/Broker SPO Partners II, L.P. 8/24/2005 Buy 21,644 33.30 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 66 33.09 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 13,902 33.10 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 1,530 33.12 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 48 33.13 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 48 33.14 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 72 33.15 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 30 33.24 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 48 33.28 Open Market/Broker San Francisco Partners, L.P. 8/24/2005 Buy 1,356 33.30 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 19,082 33.07 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 94 33.08 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 282 33.12 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 188 33.15 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 658 33.17 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 188 33.19 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 846 33.20 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 282 33.21 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 4,042 33.22 Open Market/Broker

Pages 53 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/25/2005 Buy 470 33.25 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 470 33.28 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 752 33.29 Open Market/Broker SPO Partners II, L.P. 8/25/2005 Buy 29,846 33.30 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 1,218 33.07 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 6 33.08 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 18 33.12 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 12 33.15 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 42 33.17 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 12 33.19 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 54 33.20 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 18 33.21 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 258 33.22 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 30 33.25 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 30 33.28 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 48 33.29 Open Market/Broker San Francisco Partners, L.P. 8/25/2005 Buy 1,954 33.30 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 94 33.13 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 564 33.14 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 94 33.16 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 658 33.21 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 752 33.26 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,034 33.30 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,504 33.32 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 94 33.33 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,410 33.34 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 470 33.35 Open Market/Broker

Pages 54 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- SPO Partners II, L.P. 8/26/2005 Buy 658 33.36 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,034 33.37 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,128 33.38 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,316 33.39 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 15,886 33.40 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 282 33.41 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,128 33.42 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 282 33.43 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,316 33.45 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 2,632 33.46 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,034 33.47 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 1,974 33.48 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 376 33.49 Open Market/Broker SPO Partners II, L.P. 8/26/2005 Buy 7,480 33.50 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 6 33.13 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 36 33.14 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 6 33.16 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 42 33.21 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 48 33.26 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 66 33.30 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 96 33.32 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 6 33.33 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 90 33.34 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 30 33.35 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 42 33.36 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 66 33.37 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 72 33.38 Open Market/Broker

Pages 55 of 56 pages DATE OF PRICE PER WHERE/HOW TRANSACTION REPORTING PERSON TRANSACTION TYPE NUMBER OF SHARES SHARE ($) EFFECTED - ---------------------------- ---------- ---- ---------------- --------- ---------------------- San Francisco Partners, L.P. 8/26/2005 Buy 84 33.39 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 1,014 33.40 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 18 33.41 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 72 33.42 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 18 33.43 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 84 33.45 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 168 33.46 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 66 33.47 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 126 33.48 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 24 33.49 Open Market/Broker San Francisco Partners, L.P. 8/26/2005 Buy 520 33.50 Open Market/Broker

Page 56 of 56 pages EXHIBIT INDEX EXHIBIT DOCUMENT DESCRIPTION PAGE NO. - ------- ------------------------------------ -------- A Agreement Pursuant to Rule 13d-1 (k) 1 B Power of Attorney 2

                                    EXHIBIT A

         Pursuant to Rule 13d-1(k) of Regulation 13D-G of the General Rules and
Regulations of the Securities and Exchange Commission under the Securities
Exchange Act of 1934, as amended, the undersigned agrees that the statement to
which this Exhibit is attached is filed on behalf of each of them in the
capacities set forth below.


Dated: August 29, 2005                     By:     /s/ Kim M. Silva
                                               --------------------------------
                                                   Kim M. Silva

                                           Attorney-in-Fact for:

                                           SPO PARTNERS II, L.P.(1)
                                           SPO ADVISORY PARTNERS, L.P.(1)
                                           SAN FRANCISCO PARTNERS II, L.P.(1)
                                           SF ADVISORY PARTNERS, L.P.(1)
                                           SPO ADVISORY CORP.(1)
                                           JOHN H. SCULLY(1)
                                           WILLIAM E. OBERNDORF(1)
                                           WILLIAM J. PATTERSON(1)

                                           (1) A Power of Attorney
                                           authorizing Kim M. Silva to
                                           act on behalf of this
                                           person or entity is filed
                                           as Exhibit B.

EXHIBIT B POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that SPO Partners II, L.P., SPO Advisory Partners, L.P., San Francisco Partners II, L.P., SF Advisory Partners, L.P., SPO Advisory Corp., John H. Scully, William E. Oberndorf and William J. Patterson (each a "Grantor") have made, constituted and appointed, and by these presents do make, constitute and appoint, each of William E. Oberndorf and Kim M. Silva (each an "Attorney"), the true and lawful agent and attorney-in-fact, with full power of substitution and resubstitution, of the Grantor, for and in Grantor's name, place and stead, in any and all capacities, to do all or any of the following acts, matters and things: 1. To sign on behalf of the Grantor statements on Schedule 13D or 13G or Forms 3, 4 and 5, or amendments thereto pursuant to Section 13(d) or Section 16 under the Securities Exchange Act of 1934. 2. To do all such other acts and things as, in such Attorney's discretion, he or she deems appropriate or desirable for the purpose of filing such statements on Schedule 13D or 13G or Forms 3, 4 and 5, or amendments thereto. 3. To appoint in writing one or more substitutes who shall have the power to act on behalf of the Grantor as if that substitute or those substitutes shall have been originally appointed Attorney (s) by this Power of Attorney and/or to revoke any such appointment at any time without assigning any reason therefor. The Grantor hereby ratifies and confirms all that said agents and attorneys-in- fact or any substitute or substitutes may lawfully do or cause to be done by virtue hereof. This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 or to file reports under Section 13(d) of the Securities Exchange Act of 1934 with respect to the undersigned's holdings of and transactions in securities issued by Cabot Corporation, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact. The words Grantor and Attorney shall include all grantors and attorneys under this Power of Attorney. [Signatures on the Following Pages.]

IN WITNESS WHEREOF, each Grantor duly assents to this Power of Attorney by his, her or its signature as of the 29th day of August, 2005. SPO PARTNERS II, L.P. By: SPO Advisory Partners, L.P. Its: General Partner By: SPO Advisory Corp. Its: General Partner By: /s/ William E. Oberndorf ---------------------------- Name: William E. Oberndorf Title: Vice President SF ADVISORY PARTNERS II, L.P. By: SPO Advisory Corp. Its: General Partner By: /s/ William E. Oberndorf ---------------------------- Name: William E. Oberndorf Title: Vice President SAN FRANCISCO PARTNERS II, L.P. By: SF Advisory Partners, L.P. Its: General Partner By: SPO Advisory Corp. Its: General Partner By: /s/ William E. Oberndorf ---------------------------- Name: William E. Oberndorf Title: Vice President

SF ADVISORY PARTNERS, L.P. By: SPO Advisory Corp. Its: General Partner By: /s/ William E. Oberndorf ---------------------------- Name: William E. Oberndorf Title: Vice President SPO ADVISORY CORP. By: /s/ William E. Oberndorf ---------------------------- Name: William E. Oberndorf Title: Vice President JOHN H. SCULLY /s/ John H. Scully ------------------ WILLIAM E. OBERNDORF /s/ William E. Oberndorf ---------------------------- WILLIAM J. PATTERSON /s/ William J. Patterson ------------------------