Sometimes, the single scan spectrum selected from the peak apex is
not the most accurate mass spectrum (due to an experimental artifact
called 'tilting'). For this reason, it is usually better to average
the spectra collected during the entire chromatographic peak. To do
this, place the cursor on the first scan to be included in the average;
press and hold the right mouse button, and drag the cursor to the
last scan to be included. When the right button is released, the average
spectrum will be displayed.
Exercise: Display the average spectrum over one (or several) of the chromatographic peaks in the file EVALDEMO.D.