The magnitude of delay is varied between these two extremes by varying the relative levels of {HEAD ~ operation} of {TAIL ~ the differential sections} D1 and D2 
of
The magnitude of delay is varied between these two extremes by varying the relative levels of { HEAD ~ operation } of { TAIL ~ the differential sections } D1 and D2
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH