set strsiz hsiz <vsiz>
This command sets the string character size, where
hsiz is the width of the characters,
vsiz is the height of the characters, in virtual page
inches. If vsiz is not specified, it will be set the
the same value as hsiz.
Beginning with GrADS version 2.1.a0, additional fonts are available with the Cairo graphics library. Please see the documentation on Font Control for more information. This command controls the font size for both Hershey and Cairo fonts. Because the Hershey fonts are vector-based, you can give different scaling factors for the width and height of the letters and the font will stretch accordingly. For Cairo fonts, only one scaling factor (the vertical size) is appropriate -- the fonts do not deform in the X or Y dimension, they simply get bigger or smaller. If vsiz is not given, hsiz will be used instead.