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Evolution of the Mean Mass Fraction of Oxygen (MFO2 on left vertical axis) and Carbon dioxide (MFCO2 on right vertical axis) at the mouth of the mannequin during the inspiratory period once the equilibrium state is reached between two successive cycles (see text). The inspiration begins at time (t= 0) and stops at time (t = 1.25 sec). Dashed lines indicate the mass fractions of fresh and exhaled air.
