/usr/share/doc/ruby-gsl/examples/sf/SiCi.rb 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 | #!/usr/bin/env ruby
require("gsl")
x = GSL::Vector.linspace(0.1, 12, 100)
s = GSL::Sf::Si(x) - Math::PI/2.0
c = GSL::Sf::Ci(x)
GSL::Vector.graph(x, s, c, "-T X -C -g 3 -y -1.5 1 -L 'Red: Sine integral, Green: Cosine integral'")
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