Hi Graeme, there seems to be a problem with printcal in the latest release, caused by the -p-switch. When I do the following: princal -v -p -i measurement.ti3 all I get is the absolute dE-curve plot. After closing the window the program terminates, no *.cal-file is created. Whitout the -p-switch everything goes just fine. Not to be forgotten: It happens on a Intel-based Mac running Mac OSX 10.6.8. The windows-version works fine. -- Vladimir