Stability map (MEGNO) for a particle at different periods and inclinations, in the presence of the known planet λ² For b. The color bar indicates the linear scale of the MEGNO statistic, for which darker colors represent a higher degree of orbital divergence (chaos) on timescales of 10⁵ orbits of λ² For b. Lighter shaded regions denote stable orbits. The upper range of the color bar has been truncated at a MEGNO value of 4 for clarity. The marginalized posterior distribution of the 33-day orbit is shown in green, with the median indicated by the square symbol. Orbits in resonance with λ² For b are indicated by vertical dashed lines. Additional resonances are not marked for clarity. The solid black square denotes the period and eccentricity of λ² For b.