 
         @
 
-    # Un-hide data series.  Mutates the data.
+    # Un-hide data series.
     show: (keys)->
         @hide keys, false
 
-    # Flip data series on/off.  Mutates the data.
+    # Flip data series on/off.
     toggle: (keys)->
         metadata = chart.metadata()
         if not (keys instanceof Array)


        @

    # Turn everything off except for the given data series.  Mutates the data.
    showOnly: (key)->
        metadata = chart.metadata()
        for d in data

                break
        @

    # Mark a given data series as hidden.
    hide: (keys, flag = true)->
        metadata = chart.metadata()
        if not (keys instanceof Array)
