Specific considerations govern the designers selection of {HEAD ~ the amount} of {TAIL ~ delay} provided by the reference delay unit 205 
of
Specific considerations govern the designers selection of { HEAD ~ the amount } of { TAIL ~ delay } provided by the reference delay unit 205
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH