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