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Fig. 12. Three-dimensional sketches that illustrate the proposed (A) near-fin and
(B) far-fin wake of the caudal fin-wave propagation (CFP). The curved black
arrows indicate the direction of vortex rotation. (B) The two-dimensional
sketch at the upper right illustrates the vortex filaments of the far-fin wake
observed on a parasagittal plane. Dashed lines and arrows indicate the vortex
filaments and their directions. The feature of the slightly divergent
configuration of a CFP jet is not illustrated here.