How do I indicate the difference value between two points in a chart?

[cindytroford]

Hi all

I would like to do this:

graph.png

I have several points on a curve in my chart and between each point, display the difference value.
I did the -4.3 with the drawing tool and calculate it myself: I want this to be automatic.

Thanks for your help.

[Andy Pope]

You can calculate the differences and then add another series plotted at the midpoints.

The actual relative distances can be display by linking data labels to cells.
This free add-in will help with the linking
http://www.appspro.com/Utilities/ChartLabeler.htm

[cindytroford]

Well dat's perfect. Thank you for quality answer.