(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.

Fig. 9. The evolution of (A) x and (B) y positions of the
projection of the vortex centroid on the transverse plane. Error bars indicate
measurement uncertainty. Note that due to limitations on FTLE integration
time, these plots are for the first 400 ms of a 600 ms fin beat cycle; see
also Figs 10,
11,
12. Squares, calculated
position of the vortex centroid; solid line, spline fitting of the data.