; (2) if there is insufficient NASS data for a county (as determined under standards of the Secretary in effect as of the date of enactment of this Act) or the available NASS data produces a substantially disparate result, the calculation of the county yield is determined using comparable contiguous county NASS data as determined by the Farm Service Agency office in the applicable State; and (3) if there is insufficient NASS data for a comparable contiguous county (as determined under standards of the Secretary in effect as of the date of enactment of this Act), the calculation of the county yield is determined using reliable yield data from other sources, such as Risk Management Agency data, National Agricultural Statistics Service district data, National Agricultural Statistics Service State yield data, or other data as determined by the Farm Service Agency office in the applicable State. (c) (1) A supplemental payment made under the pilot program established under this section may be made to an agricultural producer who is subject to the alternate calculation method described in subsection (b) if that agricultural producer would otherwise receive a county-level agriculture risk coverage payment for the 2018 crop year in an amount that is less than the payment that the agricultural producer would receive under the alternate calculation method. (2) The amount of a supplemental payment to an agricultural producer under this section may not exceed the difference between— (A) the payment that the agricultural producer would have received without the alternate calculation method described in subsection (b)