#!/bin/bash
plot="set title 'Refractive index';set xrange [0:4];set yrange [-3:2]; set xlabel '$\omega/\omega_{pe}$'; set ylabel '\$N^2\$';set arrow from 1,-3 to 1,2 nohead lc rgb 'black'"
plot="$plot;n_e=1e19;e=1.6e-19;eps0=8.8e-12;m_e=9e-31;w_pe=sqrt(n_e*e**2/eps0/m_e); f(x) = 1-w_pe**2/x**2; ;plot f(x*w_pe) w l lw 4 title 'plasma \$1-\omega_{pe}^2/\omega^2\$',0 w l lw 4,1 w l lw 4 t 'vacuum'"
echo $plot | gnuplot --persist
#exit
echo "set terminal epslatex size 15cm,12cm color colortext standalone;set output 'fig.tex';"$plot|gnuplot ;pdflatex fig.tex
convert -density 300 fig.pdf fig.jpg
