           event: 'mouseout'  # silly IE
         position:
           my: 'bottom right'
-          at: 'top right'
+          at: 'top center'
 
     refresh: =>
       total_value = @node_list.grand_total()

        data(@sector_list.models, (d) -> d.get 'key' ).
        transition().duration(500).
        attr("dy", (d) => @x(d.total_value() / 2) + 5 ).
        text((d) -> "#{d.get 'key'} #{Metric.autoscale_value d.total_value(), 'MJ', 2}")

      # we need to track the offset for every sector
      offsets = {}

    label: => @get('label') || @get('gquery')
    key:   => "#{@get 'carrier'}_#{@get 'sector'}"
    tooltip_text: =>
      "#{@get 'carrier'} #{@get 'sector'}<br/>#{parseInt @val()}PJ"

  NodeGroup: class extends Backbone.Model
      initialize: ->
