Each of the gas supply nozzles may branch of {HEAD ~ a single supply line} connected to {TAIL ~ a single source gas supply} 
connected to
Each of the gas supply nozzles may branch of { HEAD ~ a single supply line } connected to { TAIL ~ a single source gas supply }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL