A mixture of silane, phosphine and boron trichloride is flowed into {HEAD ~ the reactor tube} through {TAIL ~ a first pair} of silane injectors 
A mixture of silane , phosphine and boron trichloride is flowed into { HEAD ~ the reactor tube } through { TAIL ~ a first pair } of silane injectors
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH