Top panel: stability map on the (Δϖ,ϖ₂)-plane of initial conditions (all other elements are fixed at those given by the best-fit of Johnson et al. 2011): blue symbols show configurations stable over 7 Myr, while gray symbols show orbits unstable over this time interval. Location of the best-fit configuration from Johnson et al. (2011) is shown by a cross, together with the uncertainty bars. Bottom panel: transformation of the top panel to the (Δϖ,σ₂)-plane.