CROSS

          REAL CROSS

    Indicate  the  size (in arcsec) of a cross to be drawn at the map projection
    center, as a reference marker for relative positions.  If  0,  no  cross  is
    drawn.

    If  CROSS  is non 0 and a script "my_cross.ima" is in the current directory,
    this script is executed instead of drawing a simple cross.  This  allows  to
    display for example minor and major axes of inclined disks.  A generic exam-
    ple of such a script is available in
              gag_demo:my
    It can be tailored by controlling the variables in the mycross% structure.