How can I add +/- 20% variance lines to the forecasted trendline on my burndown chart?

Question

I am using Greenhopper to create burndown charts for my team.  The burndown chart depicts our forecasted trendline well.  I would like to add a "+20% variance" and a "-20% variance" line above and below, respectively, my forecasted trendline.  These lines are intended to depict our acceptable level of variance in the burndown.

Is it possible to add such a line?

Timothy · Accepted Answer

Unless you write your own add on module using the data from JIRA Agile, that is not an option at the moment.