The display command is how you actually display data via the graphics output window. The command is:
display expression
The simplest expression is a variable abbreviation.
If you display when all dimensions are fixed, you get a single value which is typed out.
If you display when one dimension varies, you get a 1-D line graph (by default).
If you display when two dimensions are varying, you get a 2-D contour plot (by default).
The groundwork has not yet been completely laid to describe this in more detail at this point. GrADS will overlay the output from each display command. To clear the display, enter:
clear (or just c)
To leave GrADS, enter:
quit
or ctrl-C under unix