The method 4, wherein {TAIL ~ the at least one plant} is {HEAD ~ a cryogenic air separation plant} 
The method 4 , wherein { TAIL ~ the at least one plant } is { HEAD ~ a cryogenic air separation plant }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD