Fig 7 -

Left column: exact analytical pairwise changes in direction as prescribed by the zonal model (SI Section S2.2 in S1 File) with rr = 1;Δro = 5;Δra = 8;φi,j ≤ 0 and ωblind = 90°, where angular differences are negative. The focal individual will not adjust its velocity in response to neighbours in the black region (exterior to the zone of attraction), nor to neighbours in the blind zone (here, the green coloured wedge trailing the focal individual). Middle and right column: results of force mapping where emergent motion was cohesive, but not parallel (middle column), or parallel (right column).