Further release of gas and {HEAD ~ stratification} of {TAIL ~ the oil} and water occurs within the post heating zone 32 
of
Further release of gas and { HEAD ~ stratification } of { TAIL ~ the oil } and water occurs within the post heating zone 32
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH