Past obliquity of Saturn as a function of Titan’s migration velocity and Saturn’s polar moment of inertia. Each panel of Fig. 7 corresponds here to a vertical slice. The colour scale depicts the minimum obliquity of the oscillation range, and the white curve highlights the 5° level. The 3σ uncertainty ranges of Lainey et al. (2020) yield today approximately b∕b₀ ∈ [1∕2, 5] for the astrometric measurements and b∕b₀ ∈ [1, 3∕2] for the radio-science experiments (see Fig. 3).