MASK
Keywords: greg

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##
MASK

            [GREG2\]MASK [IN|OUT] [/BLANKING Bval]

        masks all pixels of the Regular Grid array lying inside (if argument  is
        IN)  or  outside  (if argument is OUT or by DEFAULT) the current polygon
        (see command POLYGON) by attributing them a blanking value.  This  value
        is  defined  by  command  SET BLANKING,  or  specified  using the option
        /BLANKING Bval.