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