More preferably, {TAIL ~ the diameter} of the spray openings of the gas supply nozzles would increase the closer the spray opening is to {HEAD ~ the terminal end} of the nozzle  
More preferably , { TAIL ~ the diameter } of the spray openings of the gas supply nozzles would increase the closer the spray opening is to { HEAD ~ the terminal end } of the nozzle
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH