scale (LON LAT)              

   If no argument, SCALE reports the current parameters used for display.
   Parameters are: center of projection, center of image, size of image,
   and projection type.

   If there are two arguments LON and LAT, SCALE calculates the above
   parameters just according to the arrays LON and LAT and then reports 
   them. One thing should be careful: paramters returned by SCALE are not
   the ones the program will use to display until using APPLY.

