Graphs for the introduction to gnuplot for LaTeX users appeared on ArsTeXnica on April, 2011. http://www.guit.sssup.it/arstexnica/
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#
# 02_parabola
#
# Created by Emiliano Vavassori on 2011-03-14.
# Copyright (c) 2011 __MyCompanyName__. All rights reserved.
#
set terminal lua tikz color solid tikzarrows scale 0.64,0.53
set output "../img/02_parabola.gtx"
f(x) = x**2 -2*x +3
plot f(x) title "$ f(x) = x^2 -2x +3 $"