A method 1 wherein {TAIL ~ the oxygen content} of the gas is from about 1% to {HEAD ~ about 100%} 
A method 1 wherein { TAIL ~ the oxygen content } of the gas is from about 1 % to { HEAD ~ about 100 % }
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD