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Gnuplot makes it very easy to produce nice looking eps plots from the numerical output of your simulation. A good starting points is the following snippet. Either type in following on the gnuplot prompt, or save it in a file and run it from gnuplot with load "file.p".

set terminal postscript enhanced color size 5,4 "Helvetica,10"
set out "test.eps"
set pointsize 2
set border linewidth 0.5
unset key
set title "Some plot"
set xlabel "{/Symbol s}"
set ylabel "field"
plot "data1d.txt" with points, \
     "data1d.txt" smooth csplines with lines
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