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Fig. 7. Mean flow in an 8x8 mm region, 8 mm behind the tail, plotted against
the mean tail speed. Filled symbols represent lateral velocities, and open
symbols indicate axial velocities. Shades from white to red represent
different swimming speeds, and symbol shape indicates different individuals.
The linear and quadratic regression lines for axial and lateral velocities,
respectively, are shown with thick black lines, and the r2
values and regression equations are indicated nearby.