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Fig. 3. Enlarged records of acceleration and body angle during phases of the same
dive as in Fig. 1. (A) High
frequency component of heave (XH: foot stroke), that of surge (YH: forward
thrust) and body angle at the start (0–1 m depth) and, (B) middle of
descent phase (28–30 m depth) and (C) those at the bottom phase (40 m
depth). The high frequency components were obtained using the three types of
low-pass filter, where the end of the first band/the start of the second band
were 0.1/0.5 Hz, 1/1.5 Hz and 2/3 Hz, and shown by different types of lines.
Thick horizontal bars in heave show power strokes. Circles in the figures for
high frequency component of surge indicate forward thrusts (see the text for
definition).
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