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Specify the Step in pixels between adjacent display of polarization vectors. If not specified, or if 0, Step is empirically derived from the angular resolution.
Xfirst and Yfirst indicate the starting pixel along the X and Y axis respectively, allowing a controlled centering of the vector distribution on the background image.
Type, Min, and Max, like Step, Xfirst, Yfirst are "sticky" (remanent): they keep the previous value until a new one is specified, or are reset to their default values by use of the /COMPUTE option. Default is 0 for Step, 1 for Xfirst and Yfirst.