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Relative to when (A) the dorsal and caudal fins are flapped in-phase, the shape of the thrust and lateral forces is noticeably different when the dorsal fin phase is (B) 90°, (C) 150°, (D) 180°, and (E) −90°. Bounded lines indicating the peak thrust magnitude (blue) and thrust pulse width (red) for the in-phase fins (A) are overlaid on force curves at all phases to aid in comparison.
