         .attr("d", (link) => @link_line link.path_points())
       links.on('mouseover', @link_mouseover)
         .on('mouseout', @node_mouseout)
-      return links
+      links
 
     draw_nodes: =>
       colors = d3.scale.category20()

    # are both inbound and outbound, let's use the max size. Ideally the values
    # should match
    value: =>
      _.max [
        _.inject(@left_links, ((memo, i) -> memo + i.value()), 0),
        _.inject(@right_links,((memo, i) -> memo + i.value()), 0)
      ]

    # returns an array of the other nodes that belong to the same column. This
    # is used by the +y_offset+ method to calculate the right node position

        .attr("y", (d) => @y(d.y_offset() + d.value() / 2) )
        .text((d) -> d.label())
      @setup_tooltips()
      nodes

    setup_tooltips: ->
        $("g.node").qtip
