FOC Instrument Science Report 061 5/21/92 "The Algorithms and Software Used to Process the Orion Flat Field Data" by P. Greenfield Abstract excerpted from report: The algorithms and software used in the derivation of the results presented in the Instrument Science Report FOC 060 are described in greater detail. In particular, the details of the image preparation, nonlinear least squares fitting, and spline interpolation are described as well as the program listings included.