Hi Scott,
Good to hear from you. Hope you are doing well these days.
I was a little taken aback at the request. Surely we had this, since we show mass error PPM on the chromatograms now... But, it actually never got added to the Spectrum Match graph.
On the right-click menu, you can show both Ion m/z values (canonical calculated values) and Observed m/z values to 2 decimal places (around 10 ppm), which doesn't quite seem like enough for high accuracy mass spec.
Anyway, good idea. We will add Mass Error to this right-click list and show it in PPM.
Thanks for the feedback.
--Brendan