# File temp/Graph/Plot.rb, line 179
      def x_range
        max_value = @data.collect{|x| x[:data][X][-1] }.max
        min_value = @data.collect{|x| x[:data][X][0] }.min
        min_value = min_value<min_x_value ? min_value : min_x_value if min_x_value

        range = max_value - min_value
        right_pad = range == 0 ? 10 : range / 20.0
        scale_range = (max_value + right_pad) - min_value

        scale_division = scale_x_divisions || (scale_range / 10.0)

        if scale_x_integers
          scale_division = scale_division < 1 ? 1 : scale_division.round
        end

        [min_value, max_value, scale_division]
      end