Hi Graeme I use chartread -v -H -T0.4 So after I exclude -H and give -T1.5 tolerance I got good readings and good profile Dimitrije Zivkovic On Aug 24, 2013, at 9:55 AM, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote: > Dimitrije Zivkovic wrote: > > Hi, > >> I got large error over 20 after profile calculation. > > So I'm guessing that you haven't actually compared measurements > made with the two drivers, you just have some problems making > good profiles ? > > Graeme Gill. >