{TAIL ~ Reflux} to the high pressure column 108 is provided by {HEAD ~ reboiler/condenser} 110 
{ TAIL ~ Reflux } to the high pressure column 108 is provided by { HEAD ~ reboiler / condenser } 110
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH