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Recordings from a spontaneously breathing rat (1) before and (2) after vagotomy. Data were taken at the end of each experimental period indicated in Fig. 1. Panel A: hyperoxic normocapnia (eucapnia) baseline, hyperoxic normocapnia background, hypoxic normocapnia period. Panel B: hyperoxic normocapnia baseline, hyperoxic hypercapnia background, hypoxic hypercapnia period.
