The value labels can display a 3rd dimension on an X-Y chart; a 4th dimension on a ternary, bubble, contour point, and 3-D scatter chart; and a 5th dimension on a bubble,
ternary contour, and 4-D scatter chart.
The value labels can be used as tags or can replace the data point markers (as shown in the image below).
An Example of Value Labels
Using Value Labels to Display Values of a 3rd Variable on an XY Scatter Chart