RGMAP /PENS

        [GREG2\]RGMAP /PENS [Pos Neg]

    Selects the pens for positive and  negative  contours.  Three  modes  of
    operation are possible :
      - Without option /PENS, positive contour levels use pen 0 and negative
        contour  levels  use  pen 15. Positive means that the value given in
        command LEVELS is positive, not the final contour level value  which
        is affected by a possibly negative factor.
      - With option /PENS, all contours use the current pen.
      - With /PENS Pos  Neg,  positive  contours  use  pen  number  Pos  and
        negative contours use pen number Neg.