The second on {HEAD ~ disc position} is in {TAIL ~ substantial coincidence} with an outermost position within the first data recorded region 
is in
The second on { HEAD ~ disc position } is in { TAIL ~ substantial coincidence } with an outermost position within the first data recorded region
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH