Use the Data Tip Options dialog box to specify the information that is displayed when the mouse is over a marker on a graph. Markers represent data on the graph.
Series Label box -- Specifies whether to show the label of the series that the marker belongs to.
Group Label box -- Specifies whether to show the label of the group that the marker belongs to.
Value box -- Specifies whether to show the data value that the marker represents.
Percent box -- Specifies whether to show the percent value that is represented by a slice in a pie or ring graph. The percent value is the percentage of that slice in relation to the entire pie or ring. This option is only available for graph types that represent data as slices.