Fig. 4

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Tidal evolution of the semi-major axes of Ariel and Umbriel (Eq. (76)). The orange point marks the current observed values (Table 1). The dashed line gives the position of the nominal 5/3 MMR relation between a2 and a1 (Eq. (77)). The blue point gives the best estimation for the semi-major axes at the nominal resonance (Eq. (78)).
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