Variations in the reflected energy caused by intrusion of the area adjacent the coil, including the areas above or beneath the coil, are processed by {HEAD ~ detection system signal processing equipment} to determine the incidence and {TAIL ~ location} of intrusion events 
to determine
Variations in the reflected energy caused by intrusion of the area adjacent the coil , including the areas above or beneath the coil , are processed by { HEAD ~ detection system signal processing equipment } to determine the incidence and { TAIL ~ location } of intrusion events
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH