RGMAP /PENS

        [GREG2\]RGMAP /PENS [Pos Neg]

    Selects the pens for positive and negative contours. Three modes of  op-
    eration 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  nega-
        tive contours use pen number Neg.