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Fig. 6. Relationship of the wake jet diameter to body wavelength. Shades from white
to red represent different swimming speeds, and marker shape indicates
different individuals. The convex hull containing each individual's points is
shown with thin black lines. A linear regression line is shown with a thick
black line, and a gray dotted line indicates a slope of 0.5. The P
and r2 values, and the regression equation, are given in
the corner.