The above embodiment has described the use of {HEAD ~ the vapor} produced in {TAIL ~ the final evaporation stage}, but also vapor generated in other evaporation stages may be used, if the properties of the vapor are suitable for the purpose 
The above embodiment has described the use of { HEAD ~ the vapor } produced in { TAIL ~ the final evaporation stage } , but also vapor generated in other evaporation stages may be used , if the properties of the vapor are suitable for the purpose
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH