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