{HEAD ~ 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 detection system signal processing equipment to determine {TAIL ~ the incidence} and location of intrusion events 
{ HEAD ~ 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 detection system signal processing equipment to determine { TAIL ~ the incidence } and location of intrusion events
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