Several options may be set in the PostScript driver.
Syntax:
set terminal postscript {<mode>} {<color>} {<dashed>}
{"<fontname>"} {<fontsize>}
where <mode> is landscape, portrait, eps or default. Selecting default sets all options to their defaults. <color> is either color or monochrome. <dashed> is either solid or dashed. ''<fontname>'' is the name of a valid PostScript font. <fontsize> is the size of the font in PostScript points. Defaults are landscape, monochrome, dashed, ``Helvetica'', and 14pt. Default size of PostScript plot is landscape mode 10 inches wide and 7 inches high.
To get EPS output, use the eps mode and make only one plot per file. In eps mode the whole plot is halved in size; the fonts are half the given size, and the plot is 5 inches wide and 3.5 inches high.
Examples:
set term postscript default # old postscript
set term postscript landscape 22 # old psbig
set term postscript eps 14 # old epsf1
set term postscript eps 22 # old epsf2
set size 0.7,1.4
set term post portrait color "Times-Roman" 14