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Impedance, Zrs, in a healthy child showing both the resistive component (top) and the reactance component (bottom) before (closed circles) and after (open circles) bronchodilator administration. Compare to Fig. 5. After bronchodilator administration, the resonant frequency falls, and the low frequency reactance area (red triangle) decreases (orange triangle). (Modified with permission from Ref.5 Beydon 2007)
