reset
set terminal postscript eps enhanced font "Arial-narrow" 24
set output "fig_gpl_2axes.eps"
set size ratio 0.7

set xrange [0:20]
set yrange [0:10]
set x2range [-100:100]
set y2range [-50:50]
set xtics 0,5,20
set ytics 0,2,10
set x2tics -100,50,100
set y2tics -40,20,40

set my2tics
set grid xtics ytics

set xlabel "Name of x-axis"
set ylabel "Name of y-axis"
set x2label "Name of x2-axis"
set y2label "Name of y2-axis"

set key box spacing 1.3 width -1
plot \
"-" axes x1y1 with linespoints lt 1 pt 7 lw 5 ps 3 title "xy-plot", \
"-" axes x2y2 with linespoints lt 2 pt 8 lw 5 ps 3 title "x2y2-plot"
 2.5 1
 7.5 5
12.5 6
17.5 3
e
-75  40
-25  20
 25 -30
 70  20
e