Additionally, mass flow controllers may be employed to measure the flow of gas through {HEAD ~ each} of {TAIL ~ the supply lines} 98 
of
Additionally , mass flow controllers may be employed to measure the flow of gas through { HEAD ~ each } of { TAIL ~ the supply lines } 98
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH