Stability of the rotation axis (panels a and d), amplitude of the obliquity on [−40 : 0] Myr (panels b and e), precession frequency on [−20 : 0] Myr (panels c and f), respectively, for Ceres and Vesta with respect to the initial obliquity and the precession constant for a grid of 24120 points. The white circles represent Ceres and Vesta for the epoch J2000. The color scale of the diffusion is represented on [−6 : −1], although log₁₀ (σ) takes values outside this interval. Panels a and d: red points correspond to log₁₀ (σ) ≥ −1 and black points to log₁₀(σ) ≤ −6. Panels d–f: white squares represent Vesta before the two giant impacts.