system: You are a contract-analysis assistant performing a span-extraction task. You are given an excerpt from a commercial contract and the name of a clause type to locate within it.

Return the exact text of the requested clause, copied verbatim from the excerpt — identical wording and punctuation, with no paraphrasing, summarising, explanation, or added commentary.

The excerpt is one window of a much longer contract and often will not contain the requested clause. If the requested clause does not appear in this excerpt, respond with exactly: Not found.

Output only the extracted clause text, or the exact string `Not found.` — nothing else.

user: Contract excerpt:
"""
------- Effective Date [****] Commencement Date [****] 12/31/97 [****] 1/1/98 [****] 4/1/98 [****] 7/1/98 [****] 10/1/98 [****] 1/1/99 [****] 4/1/99 [****] 7/1/98 [****] f) Sponsor will pay Excite a share of all gross margins Sponsor realizes on transactions, advertising, sponsorship, promotions and any other revenue generated during each year of the term of the Agreement on the Sponsor Site as a result of users referred from the Excite Site ("Total Revenue"), subject to the following conditions: i) "Gross margin" is defined as [****]. ii) Total Revenue will be measured at the end of every three months after the Commencement Date. This three-month Total Revenue amount will be compared to an amount equal to two (2) times the corresponding three-month share of the applicable sponsorship fee described in Sections 6(c) and 6(d) (each pro rata share a "Revenue Floor"). 8 9 CONFIDENTIAL iii) If the Total Revenue earned by Sponsor during the three-month period exceeds the total of the Revenue Floor applicable to the same three-month period, Sponsor will pay Excite [****] of the gross margin Sponsor realizes on the gross revenue amount equal to the excess of the Total Revenue over the Revenue Floor during the three-month period. iv) If the Total Revenue earned by Sponsor during the three-month period does not exceed the Revenue Floor applicable to the same three-month period, Sponsor will not be obligated to pay Excite any share of the gross revenue realized during the three-month period. g) Payments of shared gross margin will be due to Excite within thirty (30) days of the end of each calendar quarter in which the revenue is recognized by Sponsor. h) With each payment, Sponsor will provide to Excite documentation reasonably detailing the calculation of the payment. i) Sponsor will maintain accurate records with respect to the calculation of all payments due under this Agreement. Excite may, upon no less than thirty (30) days prior written notice to Sponsor, cause an independent Certified Public Accountant to inspect the records of Sponsor reasonably related to the calculation of such payments during Sponsor's normal business hours. The fees charged by such Certified Public Accountant in connection with the inspection will be paid by Excite unless the payments made to Excite are determined to have been less than ninety percent (90%) of the payment owed to Excite, in which case Sponsor will be responsible for the payment of the reasonable fees for such inspection. 8. USER DATA AND USAGE REPORTS a) All data concerning users and their behavior relating to the use of the Excite Site will be owned solely by Excite. Data relating to the use of Sponsor's Site (excluding users referred from the Excite Site) will be owned solely by Sponsor. Data relating to the use of the Co-Branded Pages will be jointly owned and shared by both parties. b) All jointly owned and shared data will be held in confidence and will not be used except in accordance with reasonable guidelines to be mutually agreed upon by the parties. 9 10 CONFIDENTIAL c) Sponsor and Excite will each provide the other via email usage reports containing the information set forth in Exhibit B ("Usage Reports"). Each Usage Report will cover a calendar month and will be delivered within fifteen (15) days following the end of the applicable month. The parties may, by mutual written agreement, alter the content of the Usage Reports. d) SPONSOR AND EXCITE WILL USE REASONABLE EFFORTS TO ENSURE THE ACCURACY OF THE USAGE REPORTS BUT NEITHER PARTY WARRANTS THAT THE USAGE REPORTS WILL CONFORM TO ANY SPECIFICATIONS AT ANY GIVEN TIME. NEITHER PARTY WILL BE HELD LIABLE FOR ANY CLAIMS AS THEY RELATE TO SUCH USAGE REPORTS, EXCEPT TO THE EXTENT THAT SUCH USAGE REPORTS SERVE AS THE BASIS FOR PAYMENTS UNDER THIS AGREEMENT. 9. CONTENT OWNERSHIP AND LICENSE a) Sponsor will retain all right, title and interest in and to the Content worldwide (including, but not limited to, ownership of all copyrights and other intellectual property rights therein). Subject to the terms and conditions of this Agreement, Sponsor hereby grants to Excite a royalty-free, non-exclusive, worldwide license to use, reproduce, distribute, transmit and publicly display the Content in accordance with this Agreement and to sub-license the Content to Excite's wholly-owned subsidiaries or to joint ventures in which Excite participates for the sole purpose of using, reproducing, distributing, transmitting and publicly displaying the Content in accordance with this Agreement b) Excite will retain all right, title, and interest in and to the Excite Site and
"""

Extract the exact clause related to "Document Name" from the excerpt above.