I have successfully created a bubble chart with data that seem correctly arranged in space.  However, I need to display the axes on the bubble chart.  Is there a function in tableau that will display the corresponding x-y axes in a map?  In the Mapping tutorial, there is an example using a dental chart as a background image.  In this example, the axes are displayed.  Were these axes created by tableau or were they part of the uploaded image? 

Thanks,

John