Median highest position in the plane of the MW vs. median guiding radius, both in kpc, (⟨Z_max⟩ vs. ⟨R⟩) for the five MMR subgroups (in the same colours as Fig. 2) in the shape of 2D kernel density plots with their respective scatter markers. The Solar group parameters are shown in grey for comparison. No star has negative ⟨Z_max⟩, but the images have been enlarged up to ⟨Z_max⟩= − 0.5 for better visualisation of the density curves. As a visual guide, the thin and thick discs thresholds are shown as black dashed and dot-dashed lines, respectively.