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Fig. 2. Data from a male bird dive. (A) Diving behavior and total surge acceleration (YG), (B) the low frequency component of surge (YL) that was given by filtering total surge (YG) using a two-band low-pass filter, and the body angle ({theta}=arcsineYL+logger attachment angle {alpha}) and (C) the high frequency component of surge (YH) that was given by subtracting the low frequency component of surge (YL) from total surge (YG).