Surviving ratio against time for test particles in resonant groups. Different Yarkovsky drifting rates |ȧ_Y| were adopted for four sets of initial conditions. The upper panel, labelled “Koronis”, is for two sets with Koronis-like inclination i₀ = 3°, while the lower panel is for Eos-like inclination sets with i₀ = 11°. The solid and dashed lines indicate the outward and inward migration by the Yarkovsky effect, respectively.