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Cohesion in a two-dimensional numerical model: (a) metric versus (b) topological interactions. A numerical model of SPPs in two dimensions either with topological or with metric interactions was simulated to check for stability against perturbations. The histogram displays the probability that an initially cohesive and polarized flock fragments into a certain number of connected components (CCs) after a predatory attach (from Ballerini et al. [4]). (Online version in colour.)
