"should therefore be greater than the value of
This option is useful, for instance, when using SNR-based masking for the FLT and/or COM models, since it allows a reasonable mask to be formed before subtracting off the first estimate of the astronommical signal.
If ast.skip is set to a negative value, it gives the largest number of iterations to perform and indicates that the
AST model should be skipped on all of them. In this case the value supplied for parameter