# File temp/Graph/Plot.rb, line 97
      def add_data data
        @data = [] unless @data
        if not(data[:data] and data[:data].kind_of? Array)
          raise "No data provided by #{conf.inspect}"
        end

        x = []
        y = []
        data[:data].each_index {|i|
          (i%2 == 0 ? x : y) << data[:data][i]
        }
        data[:data] = [x,y]
        @data << data
      end