Containers 58 and 59 of silicon and {HEAD ~ oxygen} , respectively, are coupled to tube 37 via {TAIL ~ pipe} 40 under the control of flow controllers 61 and 62, respectively 
Containers 58 and 59 of silicon and { HEAD ~ oxygen } , respectively , are coupled to tube 37 via { TAIL ~ pipe } 40 under the control of flow controllers 61 and 62 , respectively
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH