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Fig. 2. (A) Schematic diagram showing the direction of surging acceleration A(i), recorded by a PD2GT logger placed on a seal, and gravity g (=9.8 m s–2). The angle of the logger is composed of the body angle of a seal {gamma}(i) and the adjustment angle {Delta}{gamma}. Descending body angles are represented as negative values. (B) A schematic of a dive profile calculated from swimming speed S(i) and body angle {gamma}(i).