How to insert a Max & Average in a chart

[#1]

Hello,

I have that kind of charts with a products' sales before and after one event (event = week 0) (one curved line = one product)

Is there any possibility to insert in that same chart the max or/and the avertage of that products for the selected weeks?

thank u very much for your help

[#2]

oh.. and how I could do that?

[prodanov]

See this application. Trigger is in Document Properties / Trigger - Field Event triggers