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Fig. 3. (A) Averaged (n=10) vector plots based on particle motions
recorded after valve opening at the times indicated. The orientation of the
laser sheet was orthogonal to the propagation direction of the stimulus
(zy plane in Fig.
1A). The distance between the pipette and the laser sheet was
adjusted to 5 cm. Scaling vectors (large horizontal arrows) represent 12.5 cm
s-1. For better visualization, the vectors are enlarged in the
first three images. For parallel pressure measurements, a hydrophone was
placed 5 cm away from the pipette tip. (B) Mean changes in hydrodynamic
pressure (n=10) caused by the vortex ring. Inset: pressure changes,
measured 100400 ms after valve opening, at an expanded time scale. (C)
Mean water velocity (n=10) measured with an anemometer. In B and C,
zero indicates the time of valve opening. Gray shaded areas in B and C
represent ±1 s.d.