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Fig. 2. Vector plots of particle motions in the vertical plane recorded 80 ms
(top), 200 ms (middle) and 440 ms (bottom) after valve opening. Vector plots
are based on (A) individual and (B) averaged trials (n=9). Arrows
indicate the direction and velocity of particle motions. Note that the
averaged plots are similar to the plots based on individual trials, i.e. that
the vortex stimulus was reproducible from trial to trial. Scale vector, 12.5
cm s-1. In this figure, as well as in Figs
7,
8,
9,
11,
12, the fish schematic
indicates the size, location and orientation of the fish relative to the
vector plots.