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Mean-square displacement in the centre of mass reference frame, for four different flocking events: (a) 69-10, (b) 48-17, (c) 49-05 and (d) 28-10. Values of diffusion exponent and diffusion constant for each flock are: (a) α = 1.77 ± 0.02, D = 3.8 ± 0.02; (b) α = 1.73 ± 0.03, D = 3.5 ± 0.03; (c) α = 1.71 ± 0.02, D = 3.9 ± 0.03; and (d) α = 1.83 ± 0.01, D = 3.8 ± 0.01.
