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Fig. 5. Temporal changes in heart rate (beats min1; bottom), and
depth (m; top) occurring during diving relative to the point of submergence
and the points of surfacing, for long dives (240250 s; red traces) and
short dives (150140 s; black traces). Each point is the mean ±
S.E.M. of the mean values from 7 birds. The blue horizontal lines
are mean ± S.E.M. of heart rate when ashore.