31 C.F.R. § 340.8
2 In cases where bidders are required to specify the coupon rate, the lowest basis cost of money will be determined by reference to a specially prepared table of bond yields, a copy of which will be made available to all prospective bidders upon written request to the Federal Reserve Bank of New York, or the Bureau of the Fiscal Service, Treasury Department, Washington, DC 20220. Straightline interpolation will be applied if necessary.