These values will be checked automatically and will see if there is some coherence when computing the phase map. At the end of the computation, exact values will replace the approximated. The including mask is the way to restraint the computation reference to a smaller area. By this way you can avoid margin of images. Nevertheless, the phase map will be computed on the whole field.
More complex mask refers to executing masks .
Default value for the parameter is 2. 1 is better for not noisy profiles. 3 could be preferred for very noisy profiles if the number of channels is sufficient. In this case, the simple barycenter of the line is computed above this level. If the profile has several maxima or some other measurement problems occur, the result value for the phase is set to a null value .