Possible axis ratio couples (b/a, c/a) for ellipsoidal figures of equilibrium, with the Jacobi sequence (a > b > c) as a black line and the Maclaurin sequence (a = b > c) as a gray line. Haumea and Quaoar are placed in the diagram for illustration. The data and error bars for Haumea come from the observations of Ortiz et al. (2017), and the data for Quaoar come from the thermophysical model of Kiss et al. (2024).