set fontsize <value>
The fontsize setting changes the size of the fount1 used to render all text labels which appear on a plot, including keys, axis labels, etc. The value specified should be an integer in the range -4 to 5, corresponding to LaTeX’s tiny (-4) and Huge (5) sizes, for example:
set fontsize 2
The default value is zero, LaTeX’s normal fount size. As an alternative, fount sizes can be specified directly in the LaTeX text of labels, for example:
set xlabel '\Large This is a BIG label'
Footnotes