|The PLplot Plotting Library: Programmer's Reference Manual|
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Device-independent routine for setting up the viewport. The viewport
is chosen to be the largest with the given aspect ratio that fits
within the specified region (in terms of normalized subpage
coordinates). This routine is functionally equivalent to
when a ``natural'' aspect ratio (0.0) is chosen. Unlike
this routine reserves no extra space at the edges for labels.
plvpas(xmin, xmax, ymin, ymax, aspect)
This function is used in example 9.