Alternatively, {TAIL ~ each nozzle} may have its own dedicated supply line connected to a different respective source gas supply, for supplying one or more types of source gas to {HEAD ~ the chamber} if required or desired 
Alternatively , { TAIL ~ each nozzle } may have its own dedicated supply line connected to a different respective source gas supply , for supplying one or more types of source gas to { HEAD ~ the chamber } if required or desired
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 OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH