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