set xzeroaxis
set xlabel 'y'
set ylabel "{/Symbol=20 c}_q({/Symbol=20 w})"
set nokey
#set terminal latex
#set output 'fig.tex'
set terminal postscript color enhanced
set output 'fig.ps'
plot 'output.dat' u 1:2 w l 1, 'output.dat' u 1:3 w l 1,\
'output.dat' u 1:4 w l 2, 'output.dat' u 1:5 w l 2