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Show the polarization vectors derived from the Polarization Angle and Fraction maps overlaid on a background image.
Type can be I for total intensity, F for fractional polarization in percent, or P for the polarized intensity. Min and Max indicate the SCALE to be used for the color scaling (through a temporary assignments of the SCALE values for SHOW command called by MAP_POLAR).
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 I for Type, 0 for Min and Max, which implies an automatic scaling to the data range.