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Fig. 4. Mean times (± S.E.M.) spent engaged in (A) Type I, (B) Type II and (C) Type III gaping at 21, 10 and 6% O2. Data for 40°C are shown for comparison, although not included in statistical analysis, since data points were not available at 6% O2. {dagger} refers to a significant difference between 10 and 21% O2, and * refers to a significant difference between 6 and 21% O2 with post-hoc tests.