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Fig. 3.   Representative exhalation profiles describing qualitatively effect of _E and breath hold. A: control maneuver of a constant _E of ~250 ml/s. B: exhalation profiles in same subject after 15-s breath hold (note change in y-axis scale). C: exhalation profiles when _E is decreasing linearly in time during exhalation (scale as in A). ppb, Parts per billion.

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