Step 1) Make FSC plot with gnuplot
%  python /home/brignole/pyscript/dresplot.py dres.spi 2.1 dres.txt > dres.plot
%  gnuplot -persist dres.plot

Step 2) Export FSC plot as encapsulated postscript to make a figure
%  gnuplot
%  >>> set term post eps
%  >>> set output 'dres.eps'
%  >>> load 'dres.plot'
%  >>> set term x11
%  >>> set output
%  >>> quit