JEB -- Enstipp et al. 204 (23): 4081 Figure IG3

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Fig. 3. Heart rate before, during and after deep and shallow diving. Values are means ± S.D. averaged over 3 s intervals from six dives per bird (all dives 18–22 s). N depicts the number of individuals used. ‘–3’ refers to the last 3 s of the dive, preceding emergence. For comparison, resting heart rate is indicated.