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