)
              .attr("id", "dropshadowfilter")

          filter.append("feGaussianBlur")
              .attr("in", "SourceAlpha")
              .attr("stdDeviation", 4)
              .attr("result", "blur");
          filter.append("feOffset")
              .attr("in", "blur")
              .attr("dx", 5)
              .attr("dy", 5)
              .attr("result", "offsetBlur");

          var feMerge = filter.append("feMerge");

          feMerge.append("feMergeNode")
              .attr("in", "offsetBlur