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Effects of different cruise speed on curvature of trajectory and polarization of group. (a) Path curvature κ proportional to 1/radius of turning (median and interquartile). (b) Almost straight path of fast individual. (c) Curved path of slow individual. (d) Polarization (median and interquartile) of schools of different size and cruise speed [15]. Open circles, slow speed; closed circles, fast speed.
