Ions within {HEAD ~ a window} of m/z of interest are extracted via a quadrupole mass filter 24 and passed to {TAIL ~ a linear trap} 30 
Ions within { HEAD ~ a window } of m / z of interest are extracted via a quadrupole mass filter 24 and passed to { TAIL ~ a linear trap } 30
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH