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