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RGMAP /BLANKING 

        [GREG2\]RGMAP /BLANKING Bval Eval

    Override  the current blanking value as defined by command SET BLANKING.
    Contours are not drawn in pixels touching pixels with value  V  so  that
    ABS(V-Bval) <= Eval.  This  is  extremely  useful for regular grids only
    partially filled as often occur in astronomy.