Shipper hereby authorizes Gatherer to (i) enroll and participate in the Programs, as may be amended from time to time, (ii) enter into the Program Agreements set forth in Exhibit U , as may be amended from time to time, and (iii) execute the Programs exclusively in respect of operations on the Individual Systems set forth in such Program Agreements. Such authorization shall only apply to the Program Agreements set forth in Exhibit U as of the Amendment Effective Date, and to the Individual Systems set forth therein. An instrument in writing executed by the Parties in accordance with Section 16.6 shall be required prior to Gatherer executing any Program Agreements (other than the Program Agreements set forth in Exhibit U as of the Amendment Effective Date).