You can use i1 Profiler in demo mode to do both patch and chart measurements and do not need to upgrade to the full version. At the end of the post I link to updated reference files that will work with the 21x4 random target included with QTR.Take a look here: i1 Profiler and 21x4-random QTR Step Wedges i1 Profiler and 21x4-random QTR Step Wedges Use the current version of i1-Profiler to linearize custom Quad Tone Rip profiles View on www.bwmastery.com Preview by Yahoo Richard Boutwell