treater comprise vapor and {TAIL ~ water collection regions} extending along {HEAD ~ the top} and bottom, respectively, of the treater tank from the heating chamber to the settling chamber, and vapor and water outlets from these regions 
treater comprise vapor and { TAIL ~ water collection regions } extending along { HEAD ~ the top } and bottom , respectively , of the treater tank from the heating chamber to the settling chamber , and vapor and water outlets from these regions
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH