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