adjusting a delay provided by each of {HEAD ~ the delay stages} to attempt to equalize {TAIL ~ a first time difference} and a second time difference, 
adjusting a delay provided by each of { HEAD ~ the delay stages } to attempt to equalize { TAIL ~ a first time difference } and a second time difference ,
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH