plvsta.3plplot man page
plvsta — Select standard viewport
Selects the largest viewport within the subpage that leaves a standard margin (left-hand margin of eight character heights, and a margin around the other three sides of five character heights).
Redacted form: plvsta()
This function is used in examples 1, 12, 14, 17, 25, and 29.
Many developers (who are credited at http://plplot.sourceforge.net/credits.php) have contributed to PLplot over its long history.
PLplot documentation at http://plplot.sourceforge.net/documentation.php.