       @node_list = namespace.node_list = new D3.mekko.NodeList()
       @initialize_defaults()
 
+    outer_height: -> 410
     # lots of ugly transformations to adapt the current conventions
     prepare_data: =>
       sectors  = []

      margins =
        top: 10
        bottom: 100
        left: 33
        right: 10

      @width = 494 - (margins.left + margins.right)
      @height = 310 - (margins.top + margins.bottom)
      @series_height = 190 # the rest of the height will be taken by the legend
      @svg = d3.select("#d3_container_#{@model.get 'key'}")
        .append("svg:svg")

      for carrier in carriers
        @carrier_list.add
          key: carrier.label
          label: carrier.label # used by the legend
          color: carrier.color

      for s in @model.series.models
