{HEAD ~ The excursion signal generator} identifies {TAIL ~ a peak portion} of a signal exceeding a threshold, such as a magnitude threshold 
identifies
{ HEAD ~ The excursion signal generator } identifies { TAIL ~ a peak portion } of a signal exceeding a threshold , such as a magnitude threshold
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH