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