On an Excel graph, if I mouse-over a data point on the graph, the application shows me in a small pop-up window the exact X and Y data values of the point that I am mousing-over.

Is there a way to do this with Numbers.app, either as a mouse-over, or some other way, so I can see the exact data values of a given point on the graph, without having to go back and look at the table that was used to generate the graph?