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