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