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