/usr/share/doc/ruby-gsl/examples/odeiv/binarysystem.gp is in ruby-gsl 2.1.0.3+dfsg1-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | set title 'Orbital decay of the binary system J0730-3039'
set xlabel 'Time since birth [Myr]'
set ylabel 'Orbital Period [Hr]'
set y2label 'Eccentricity'
set grid
set yrange [1e-2:10]
set xrange [90:200]
set y2range [1e-4:1e-1]
#set xrange [90:2500]
#set y2range [1e-4:2e-1]
set ytics nomirror
set y2tics
set logscale y
set logscale y2
set pointsize 1
set label 1 'Present' at first 96, 0.04
set label 2 'Plunge!' at first 150, 0.04
set arrow from 100,0.03 to 100,0.013 lw 2 lt 3
set arrow from 160, 0.035 to 182, 0.011 lw 2 lt 4
plot 'binarysystem.dat' u 1:2 title 'Orbital period' w lp lw 1, '' u 1:3 axes x1y2 title 'Eccentricity' w lp lw 1
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