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