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Español: Distribución de Cauchy.
Probability density function for the Cauchy distribution

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no FrontCover Texts, and no BackCover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

gnuplot source under GPL:
dcauchy(x,l,s) = 1.0 / (pi * s * (1 + ((xl)*1.0/s)**2))
pcauchy(x,l,s) = 0.5 + atan((xl)*1.0/s) / pi
qcauchy(p,l,s) = l  s * 1.0/tan(pi * p)
set samples 1001
set terminal postscript enhanced colour solid lw 2 "TimesRoman" 20
set output
set xtics 1
set ytics 0.1
f(x,y,z) = dcauchy(x,y,z)
set key 3.6,0.65
#f(x,y,z) = pcauchy(x,y,z)
#set key 3.6,0.2
plot [5:5] \
f(x, 0, 0.5) title "{/TimesItalic x}_0 = 0, {/Symbol g} = 0.5", \
f(x, 0, 1) title "{/TimesItalic x}_0 = 0, {/Symbol g} = 1.0", \
f(x, 0, 2) title "{/TimesItalic x}_0 = 0, {/Symbol g} = 2.0", \
f(x, 2, 1) title "{/TimesItalic x}_0 = 2, {/Symbol g} = 1.0"

This work is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or any later version. This work is distributed in the hope that it will be useful, but without any warranty; without even the implied warranty of merchantability or fitness for a particular purpose. See version 2 and version 3 of the GNU General Public License for more details.http://www.gnu.org/licenses/gpl.htmlGPLGNU General Public Licensetruetrue 
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