Fraction of regular interactions (f_col > 2/3, k = 9) for each zoom level. Zoom level 0 denotes the whole initial parameter space (ι ∈ [0, π], λ ∈ [0, 2π)). Red, blue and green indicate the relative fraction (with respect to interactions of the same colour) of regular interactions where the 12.5, 15 or 17.5 M_⊙ particle escapes, respectively. The black line is the total fraction of regular interactions. The error range indicates the maximum between the Poissonian error and the difference in fraction estimate using k = 6 and k = 12 neighbours. The results for the 14th zoom-in are repeated using an arbitrary precision integrator, see Sect. 5.