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The HighCharts graphing library is a kick ass JS graping library, free for non-commercial use.
Since you may be using XHProf to aid the performance of a commercial site, a single blanket license
has already been purchased. You can use XHProf with Highcharts on any site, you do _not_ need to
purchase another license for Highcharts. If you decide to use HighCharts within another aspect
of your site, you will need to handle licensing that seperately.
The decision to use HighCharts was made as it easily supports multiple scales per axis, which makes
displaying information on PMU, CPU, and WT easy on the main display pages (this is hard/impossible
in the google graphs we looked at).
Enjoy
paul