           if point.y > 0
             s += """\
               <br/>\
-              <span style=\"color: #{ point.series.color };\">●</span> \
-              #{ point.series.name }: <b>#{ point.y }</b>"""
+              <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:

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

origSeriesOnMouseOver = Highcharts.Series::onMouseOver


Highcharts.Series::onMouseOver = (e) ->
  origSeriesOnMouseOver.call(this)
  tooltip = @chart.tooltip
  if tooltip and tooltip.shared and not @noSharedTooltip
    tooltip.refresh(@chart.hoverPoints, e)


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