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