{HEAD ~ The value} of the calibration counter is preferably stored in {TAIL ~ a non volatile memory} 
is preferably stored in
{ HEAD ~ The value } of the calibration counter is preferably stored in { TAIL ~ a non volatile memory }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL