RGMAP

        [GREG2\]RGMAP [Quiet|Fast|chunksize] [/PERCENT  P1]  [/ABSOLUTE  A1]
    [/BLANKING Bval Eval] [/GREY COLOUR N] [/KEEP File_Name [Blank]]

    Draws (or Fills) isocontours of the Regular Grid array.  The  RG  is  an
    internal   2D   "map"   created/loaded   by  various  commands  (RGDATA,
    RANDOM_MAP, RESAMPLE, IMAGE), or loaded by a calling program. The levels
    are  those specified by command LEVELS, but may be affected by a scaling
    factor by option /PERCENT or /ABSOLUTE.

    This command is normally used in the following sequence:
    Greg> SET BOX LOCATION Gx1 Gx2 Gy1 Gy2  ! Define box position
    Greg> RGDATA (options...)               ! Put image in the RG variable,
                                            ! read associated header variables
    Greg> LIMITS/RGDATA                     ! Computes associated limits
    Greg> PLOT                              ! Plot the array in the box
    Greg> BOX                               ! Draws the box
    Greg> LEVELS 0.1 to 0.9 by 0.1          ! define contour levels
    Greg> RGMAP/PERCENT 1                   ! Draw contour levels  (in this
                                            ! case, as percentage of peak)

    The "Quiet" mode does contouring silently. For  "Fast"  and  "chunksize"
    modifiers, see subtopic MEMORY_OPTIONS