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