require 'gnuplot'

x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
y = [2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.0]
Gnuplot.open do |gp|
  Gnuplot::Plot.new( gp ) do |plot|
    plot.data << Gnuplot::DataSet.new( [x, y] ) do |ds|
      ds.with = 
      ds.notitle
    end
  end
end