#set terminal png
#set output "fig.png"
set key outside width 5 spacing 2
plot "g-20.G" title "-20000" with line, \
"g-10.G" title "-10000" with line, \
"g0.G" title "0" with line, \
"g10.G" title "10000" with line, \
"g20.G" title "20000" with line

