       registration_data_series = (registration, index) ->
         # The registration image select button colors.
         COLORS = ['LightGreen', 'LightYellow', 'LightCyan', 'LemonChiffon']
-      
+    
         key = registration.title
-      
+    
         # TODO - Wrap the key in a registration parameters pop-up hyperlink.
         # Return the data series format object.
         key: key

        # 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.

      yFormat: yFormat
      highlightBolusArrival: (chart) ->
        highlightBolusArrival(session, chart)
