/usr/share/doc/ruby-gsl/examples/interp/demo.gp is in ruby-gsl 2.1.0.3+dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | set pointsize 2
set multiplot
set xlabel 'x'
set ylabel 'y'
set yrange [0:14]
set size 0.5, 0.5
set grid
set origin 0, 0.5
set key box
plot 'points'
set origin 0.5, 0.5
plot 'points', 'linear.dat' w l, 'polynomial.dat' w l
set origin 0, 0
plot 'points', 'cspline.dat' w l, 'cspline_periodic.dat' w l
set origin 0.5, 0
plot 'points', 'akima.dat' w l, 'akima_periodic.dat' w l
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