Specifies the number of polynomial coefficients in X for the flat-field model, and the re-fitted model.
A model of the flat field is made by fitting a polynomial at each X- and Y-increment. These polynomials are then used to calculate the balance factors at the 'Object' pixel positions.
NOTE: If the parameter is set to zero then no modeling in the X-direction will be performed. If the parameter is set to 1, then no polynomials are used (they would be constant), but the balance factors are calculated using the local mean value based on a TUNE_FFLSMP pixel sample. This option should be used when undersampling etc. is preventing the fitting of polynomials at all.
The default value is 1.
Martin Clayton