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:
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Customer Gas into the Transportation System as is reasonable under the circumstances. Article VI. Measurement & Testing The construction, ownership, installation, operation and maintenance of each Measurement Facility that is owned by a Person other than Transporter shall be governed by an interconnect agreement between Transporter and such Person. Each other Measurement Facility shall be constructed, installed, owned, operated and maintained by Transporter. 9 Source: PENNTEX MIDSTREAM PARTNERS, LP, S-1/A, 4/16/2015 Article VII. Gas Quality Notwithstanding anything to the contrary in this Agreement, Customer Gas received at a Point of Receipt from one of the Plants shall be deemed to be in compliance with the applicable Gas quality specifications of the Transportation System. Article VIII. Fees, Billing & Payment Fees. (a) Transportation Fee. For all Customer Gas received by Transporter at a Point of Receipt and delivered to any Point of Delivery, Customer shall pay Transporter a transportation fee of $0.04 per MMBtu. (b) Other Services Fees. If Transporter provides any compression Services with respect to Customer Gas delivered hereunder, the fees applicable to such Services shall be as mutually agreed between the Parties. The Parties agree to supplement this Agreement with an addendum or other mutually agreeable modification to memorialize the terms applicable to the provision of any such additional Services. Invoices and Statements. On or before the fifteenth (15th) calendar Day of each Month, Transporter shall provide to Customer an invoice and statement for the previous Month setting forth the calculation of the net amount due hereunder to Transporter for the Services provided hereunder during such previous Month. Payment of Statements. Within fifteen (15) calendar Days following receipt of each of Transporter's invoices and statements, Customer shall make payment to Transporter of all undisputed amounts by wire transfer, in accordance with the account information provided to Customer, unless another form of payment is agreed to in writing by the Parties. Should Customer fail to make payment in full of all undisputed amounts within such time period, interest shall accrue on the unpaid balance at the Default Interest Rate or the maximum legal rate, whichever is the lesser, from the date such payment is due until the same is paid. If Customer fails to pay Transporter undisputed amounts due hereunder and such failure is not cured within ten (10) calendar Days' of written notice from Transporter to Customer, Transporter may suspend receipt and delivery of Customer Gas without prejudice to any other available remedies at law or in equity. 10 Source: PENNTEX MIDSTREAM PARTNERS, LP, S-1/A, 4/16/2015 Billing Disputes. If a good faith dispute arises as to any amount payable hereunder, payment shall nevertheless be made when due of the amount not in dispute. Such payment shall not be deemed to be a waiver of the right to recoup any overpayment. If Customer withholds payment of any disputed amount, Customer shall, within seven (7) calendar Days after receipt of the statement for the month to which the disputed amount pertains, submit to Transporter a written explanation of the dispute and any available supporting documentation. The Parties shall then cooperate in good faith to resolve such dispute as expeditiously as possible. Audit Rights. Each Party or its designated representatives shall, upon reasonable notice to the other Party, have the right, no more frequently than two (2) times per twelve (12) consecutive calendar Months, at its own expense, at reasonable times and during normal business hours, to examine the books and records of such other Party to the extent necessary to verify the accuracy of any statement, charge, computation, or demand made under or pursuant to this Agreement. Each Party agrees to keep its records and books in accordance with generally accepted accounting practices in the oil and gas industry. Each invoice and statement shall be final as to both Parties unless questioned in writing within twenty four (24) Months following the date of such invoice or statement. Article IX. Notices Any notice, statement, claim or other communication required or permitted hereunder shall be in writing and shall be sent by: (i) hand delivery; (ii) United States mail with all postage fully prepaid; or (iii) courier with charges paid in accordance with the customary arrangements established by such courier, in each of the foregoing cases addressed to the Party at the following addresses, and shall be deemed given when received by the Party to whom it is addressed. The Parties opt out of electronic delivery of notices and amendments under this Agreement, except as to nominations, scheduling and imbalances, and except
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Extract the exact clause related to "Audit Rights" from the excerpt above.

assistant: Each Party or its designated representatives shall, upon reasonable notice to the other Party, have the right, no more frequently than two (2) times per twelve (12) consecutive calendar Months, at its own expense, at reasonable times and during normal business hours, to examine the books and records of such other Party to the extent necessary to verify the accuracy of any statement, charge, computation, or demand made under or pursuant to this Agreement.