A shock threshold of {TAIL ~ the shock detector} is initialized, and a first number of shock events is detected in response to {HEAD ~ the shock detector} operating at the initial shock threshold 
A shock threshold of { TAIL ~ the shock detector } is initialized , and a first number of shock events is detected in response to { HEAD ~ the shock detector } operating at the initial shock threshold
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH