47 C.F.R. § 27.1420

(a) For eligible space station transition and Upper C-band Clearinghouse costs, eligible space station operator incentive payments, adjacent band radio altimeter retrofit rebates, and in the event the Wireless Telecommunications Bureau selects a Relocation Coordinator pursuant to § 27.1413(a), Relocation Coordinator costs, the pro rata share of each flexible-use licensee will be the sum of the final clock phase prices (P) for the set of all license blocks that a bidder wins divided by the total final clock phase prices for all N license blocks sold in the auction. To determine a licensee's reimbursement obligation (RO), that pro rata share would then be multiplied by the total eligible reimbursement costs (RC). Mathematically, this is represented as:

(b) For incumbent earth station transition costs, a flexible-use licensee's pro rata share will be determined on a PEA-specific basis, based on the final clock phase prices for the license blocks it won in each PEA. To calculate the pro rata share for incumbent earth station transition costs in a given PEA, the same formula identified in paragraph (a) of this section will be used, except I is the set of licenses a bidder won in the PEA, N is the total blocks sold in the PEA and RC is the PEA-specific earth station and fixed service relocation costs.