said vapor removal means comprises {HEAD ~ a vapor collection region} extending along the top of said tank from {TAIL ~ one chamber} to the other, vapor outlet means from said region, and said zones opening inwardly to said region, 
extending from
said vapor removal means comprises { HEAD ~ a vapor collection region } extending along the top of said tank from { TAIL ~ one chamber } to the other , vapor outlet means from said region , and said zones opening inwardly to said region ,
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH