I have several line graphs on a single plot. I'd like to indicate what is the

mean of each of them (they are showing cumulative distributions).

Each is a different color.

I tried putting 'mean=xxx' into the legend. That works, but I think it's

confusing. The legend normally displays independent variables, not results.

I put vertical lines and then text, vertically, just below the x-axis giving the

mean values. Not very clear.

This is not really a technical question, but one of presentation style. How to

convey this information?