Cumulative distance distribution of runaway stars normalised to the total number of runaways in a non-degenerate state, N_{tot, n − d} for a ejection frequency of f_ej  =  1/300 yr⁻¹. The blue and orange curves add up to unity, with blue indicating the relative abundance of the UI subpopulation and orange represents the BI subpopulation. Red indicates the BII subpopulation normalised to the UI+UII subpopulation. Dark orange and dark red indicate the admixture of objects in the mass range 0.7−0.8 M_⊙. Panels A–D: M10, M12, M14 and M15 populations respectively.