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