{TAIL ~ Preferred reactor pressure} is from {HEAD ~ about 10 Torr} to about 100 Torr 
{ TAIL ~ Preferred reactor pressure } is from { HEAD ~ about 10 Torr } to about 100 Torr
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH