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