/usr/share/doc/ruby-gsl/examples/sf/airy_Ai.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 | #!/usr/bin/env ruby
require("gsl")
x = GSL::Vector.linspace(-10, 10, 100)
a = GSL::Sf::airy_Ai(x)
a.graph(x, "-C -g 3 -L 'GSL::Sf::airy_Ai(x)'")
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