If the detected number shock events falls below the lower event threshold , then {HEAD ~ the shock threshold} for {TAIL ~ the shock detector} is decreased in order to increase the sensitivity of the shock detector 
for
If the detected number shock events falls below the lower event threshold , then { HEAD ~ the shock threshold } for { TAIL ~ the shock detector } is decreased in order to increase the sensitivity of the shock detector
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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