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Fig. 5. (A) Apnoeic heart rate (mean ± S.E.M.) of quietly resting pre-weaned harbour seal pups (circles), weaned pups (triangles) and an adult female (A; square). (B) Apnoeic heart rate (mean ± S.E.M.) separated and categorized as `high' (>100 beats min–1) or `low' (<100 beats min–1). (C) Proportion of time spent in the low heart rate mode.