|The PLplot Plotting Library: Programmer's Reference Manual|
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Set relative margin width, aspect ratio, and relative
justification that define current device-space window. If you want to just use the previous value for any of
these, just pass in the magic value PL_NOTSET. It is unlikely that one
should ever need to change the aspect ratio but it's in there for
plsdidev is not called the default values
are all 0.
is set to a device-specific value.
plsdidev(mar, aspect, jx, jy)
This function is used in example 31.