Initial condition space in inclination ι (y-axis) and true longitude λ (x-axis). Each dot represents an individual realization among 10⁶. Top panel: colour-coded by the identity of the escaping particles. Red: 12.5 M_⊙. Blue: 15 M_⊙. Green: 17.5 M_⊙. Regions of sparse density may appear as white dots due to the white background. Bottom panel: fraction of same-colour neighbouring particles f_col, out of k = 12 nearest neighbours.