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Fig. 8. Maximum circulation value for the primary vortex plotted against the total
circulation added by the tail, estimated by equation 10. A quadratic
regression line is shown with a thick black line, and a one-to-one
relationship is shown with a gray broken line. Shades from white to red
represent different swimming speeds, and marker shape indicates different
individuals. The P and r2 values, and the
regression equation, are given in the corner.