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Fig. 4. Ventilatory response to 2 h exposure periods at various oxygenation levels
for all studied podocopids (N=56106 animals; same data as in
Table 2). (A) Respiratory
frequencies within bursts, fR, are given as means ±
1 S.E.M. (B) Number of apnoeic animals during each exposure period
expressed as percentages of the studied animals. No significant difference was
observed as a function of PO2.