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