Branching ratios of the region between 23 and 24 AU. The left-most panel shows a zoom-in of Fig. 2, where the simulation was performed using the same set-up as the one presented in Sect. 2.1. The middle panel shows the resulting branching ratios of the same region from a simulation where the planetary radii used were doubled. Similarly, the right-most panel shows the branching ratios of this region resulting from a simulation following the set-up as described in Sect. 2.1, but in which all particles were simulated using only the high-resolution time step.