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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#
# 03_sfera
#
# Created by Emiliano Vavassori on 2011-03-14.
# Copyright (c) 2011 __MyCompanyName__. All rights reserved.
#
set terminal lua tikz solid color tikzarrows
set output "../img/03_sfera.gtx"
unset key
unset border
unset xtics
unset ytics
unset ztics
set samples 64, 64
set isosamples 13, 13
set parametric
set dummy u, v
splot cos(u)*cos(v),cos(u)*sin(v),sin(u) lt 3