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Altered oxygen concentration range through adjustment of relative feed flow rates. A ratio of 1:1 O2/N2 flow rates produced a gradient from 20.50 to 0.6%, while a 1:5 ratio of O2/N2 flow rates produced a gradient from 13 to 0%. Supplying a 1:1 ratio of 10% O2 to 0% N2 produced a gradient from 9.7 to 0.38%.
