The exhaust that is not extracted continues to power the main turbine system and flows from the low pressure end to {HEAD ~ the turbine system} to {TAIL ~ a waste heat boiler} 
to
The exhaust that is not extracted continues to power the main turbine system and flows from the low pressure end to { HEAD ~ the turbine system } to { TAIL ~ a waste heat boiler }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL