This has to do with RTC 5.0.2.

I have a client who is asking me a very natural question -- "what do these projection lines really mean, and how can I use them to estimate when my project will be finished?"

It seems to me that it would be useful to include some information regarding when the user would expect the release to be complete, based upon each of the chart's trend lines.  Don't make them harvest information from the chart that they use for manual calculations -- provide that completion information on the chart, itself.