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Fig. 1. Definition of x-, y- and z-axis orientations,
jet angle (
), vortex ring angle (ß) and swimming direction
(
) in the lateral (top) and ventral (bottom) views, used to measure the
vortex wake and body kinematics of swimming leopard frogs. Subscripts v and h
represent light sheet orientation during the DPIV experiments, i.e. vertical
and horizontal, respectively.