     rangeSelector:
       enabled: false
     tooltip:
-      # shared: false
+      # shared: true
       formatter: ->
         s = """\
           <span style=\"font-size: 10px\">\

prepareChart = ->
  $chart = $('#chart')
  $chart.highcharts 'StockChart',

          if point.y > 0
            s += """\
              <br/>\
              <span style=\"color: #{ point.series.color };\">●</span>"""
            if point.series.state == 'hover'
              s += "<b> #{ point.series.name }</b>: <b>#{ point.y }</b>"
            else
              s += " #{ point.series.name }: <b>#{ point.y }</b>"
        return s
    plotOptions:
      area:
