# File lib/geo_ruby/simple_features/line_string.rb, line 51
      def m_range
        if with_m
          max_m, min_m = -Float::MAX, Float::MAX
          each do |point|
            max_m = point.m if point.m > max_m
            min_m = point.m if point.m < min_m
          end
          [min_m,max_m]
        else
          [0,0]
        end
      end