# File lib/rcov.rb, line 583
  def data(filename)
    raw_data = raw_data_relative
    update_script_lines__
    unless @script_lines__.has_key?(filename) && 
           raw_data.has_key?(filename)
      return nil 
    end
    refine_coverage_info(@script_lines__[filename], raw_data[filename])
  end