code: function drawGraph (opts) {
  
      // Clone the options, so the 'options' variable always keeps intact.
      var o = Flotr._.extend(Flotr._.clone(options), opts || {});
  
      // Return a new graph.
      return Flotr.draw(
        container,
        [ d1, d2, d3 ],
        o
      );
    }
docs: Draw graph with default options, overwriting with passed options