     highlightBolusArrival = (session, chart) ->
       # If the bolus arrival index is zero, then it does not have
       # have a tick mark, so bail.
-      if not session.bolus_arrival_index
+      if not session.bolusArrivalIndex
         return
       # Select the SVG element.
       svg = d3.select(chart.container)

define ['angular', 'chart'], (ng) ->
  intensity = ng.module 'qiprofile.intensity', ['qiprofile.chart']

  intensity.factory 'Intensity', ['Chart', (Chart) ->
    # Highlights the bolus arrival tick mark. The bolus arrival is
    # only highlighted if it occurs after the first series.  
    #

        # series key.
        reg.data_series = registration_data_series(reg, i)
      reg_data = ((reg.data_series for reg in session.registrations))
    
      # Pad the image selection buttons based on the number of series.

      # Return the chart configuration.
