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Fig. 3. Dive profile (A) and fluke rate (B) for a Ziphius. Vocal phase and
buzzes are marked on the dive profile. The average fluke rate in 1 min
intervals, measured by counting cyclic variations in the pitch signal from the
tag, is shown in the lower panel. The fluke rate is high in the first minute
of both deep and shallow dives but then drops markedly during the remainder of
the descent. Ascents, in comparison, feature more steady fluking.
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