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Fig. 4. (A) Control turtles with a brass bar attached to the harness [mean heading (arrow)=77.5°, r=0.64, N=15, P<0.001, Rayleigh test]. Lines indicate 95% confidence interval. (B) Experimental turtles with a magnet attached to the harness (r=0.0026, N=13, P>0.9, Rayleigh test).