{TAIL ~ The pressure} of the tube is maintained at {HEAD ~ 175 to 200 millitorr} while the reactant gases are flowed in 
{ TAIL ~ The pressure } of the tube is maintained at { HEAD ~ 175 to 200 millitorr } while the reactant gases are flowed in
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH