         style("stroke-width", (link) -> link.value()).
         style("stroke", (link, i) -> link.color()).
         style("fill", "none").
-        style("opacity", 0.7).
+        style("opacity", 0.6).
         attr("d", (link) => @link_line link.path_points()).
         on("mouseover", @link_mouseover).
         on("mouseout", @node_mouseout)


      @svg = d3.select("#d3_container_sankey").
        append("svg:svg").
        attr("height", @height + 2 * @margin).
        attr("width", @width + 2 * @margin).
        append("svg:g").
        attr("transform", "translate(#{@margin}, #{@margin})")
      @links = @draw_links()
      @nodes = @draw_nodes()
      @axis = @draw_axis()

      d3.selectAll(".link").
        transition().
        duration(200).
        style("opacity", 0.6).
        selectAll(".link_label").
        transition().
        style("opacity", 0)
