AUTOSIZE is useful when
you change the size of the graphics display area using one or more
of the options PAPERSIZE, XPIXELS, YPIXELS, XMAX, or YMAX. It lets
you control image text size without using PROC GDEVICE. Typically,
AUTOSIZE is on for most image drivers and off for all other types
of drivers.
Note: If you use HSIZE of VSIZE,
the character cell size changes regardless of the AUTOSIZE setting.