#! /usr/bin/gnuplot -persist
set terminal postscript eps enhanced
set output "try.ps"
set xlabel "x" font "Georgia,18"
set ylabel "y" font "Georgia,18"
set xrange [-6.5:6.5]
set yrange [-6.5:6.5]
set nokey
set encoding default
set style line 1 lt 1 pt 0
set size square
plot "try" with linespoints linestyle 1

%!PS-Adobe-3.0
%%Pages: (atend)
%%BoundingBox: 96 56 343 303
%%HiResBoundingBox: 96.400000 56.200000 342.250000 302.200000
%.....................................
%%Creator: GPL Ghostscript 864 (pswrite)
%%CreationDate: 2009/11/16 23:58:29
%%DocumentData: Clean7Bit
%%EndComments
%%BeginProlog
% This copyright applies to everything between here and the %%EndProlog:
% Copyright (C) 2009 Artifex Software, Inc.  All rights reserved.
%%BeginResource: procset GS_pswrite_1_0_1001 1.001 0
/GS_pswrite_1_0_1001 80 dict dup begin
/PageSize 2 array def/setpagesize{ PageSize aload pop 3 index eq exch
4 index eq and{ pop pop pop}{ PageSize dup  1
5 -1 roll put 0 4 -1 roll put dup null eq {false} {dup where} ifelse{ exch get exec}
{ pop/setpagedevice where
{ pop 1 dict dup /PageSize PageSize put setpagedevice}
{ /setpage where{ pop PageSize aload pop pageparams 3 {exch pop} repeat
setpage}if}ifelse}ifelse}ifelse} bind def
/!{bind def}bind def/#{load def}!/N/counttomark #
/rG{3{3 -1 roll 255 div}repeat setrgbcolor}!/G{255 div setgray}!/K{0 G}!
/r6{dup 3 -1 roll rG}!/r5{dup 3 1 roll rG}!/r3{dup rG}!
/w/setlinewidth #/J/setlinecap #
/j/setlinejoin #/M/setmiterlimit #/d/setdash #/i/setflat #
...и т.д. и т.п.