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-l Runs GrADS in landscape mode.
-p Runs GrADS in portrait mode.
If neither the -l or -p options are used, GrADS will prompt the user for a
preferred mode

Is there any possibility to determine or switch the ploting mode within a
grads script?

This would provide convenience that you don't need to worry about the
ploting model when initiating the grads.

This would also make it possible to plot two figures of different ploting
modes without quit and reinitiate the grads.