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Fig. 5. Representative data acquisition traces illustrating the lack of
correspondence between changes in arterial PCO2
(PaCO2; red trace, A), and those in ventilation, presented
as the raw impedance trace (grey, B) overlain by the calculated ventilation
amplitude (VAMP) trace (black line, B). Rather, as the
yellow area emphasizes, ventilation tracked changes in water
PCO2 (PwCO2; black line, B).