Parameters

 Keyword  Position  Type       Description
 -------  --------  ----       -----------
   INP       1      CHAR       File containing image
   GCB       -      LOGICAL    Load GCB from file
   DEV       2      CHAR       Device name
   NX        3      INTEGER    Number of horizontal zones
       Hidden default = 1
   NY        4      INTEGER    Number of vertical zones
       Hidden default = 1
   DISP      -      LOGICAL    Immediate display
       Hidden default = N
   MODE      5      INTEGER    Input mode 1=cursor 2=keyboard
       Hidden default = 1
   SLICE     -      CHAR       Range of "z" axis values