Alternatively, xenon and {HEAD ~ krypton} are recovered as solids in a liquid nitrogen cooled {TAIL ~ receiving tank} 
Alternatively , xenon and { HEAD ~ krypton } are recovered as solids in a liquid nitrogen cooled { TAIL ~ receiving tank }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL