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Fig. 4


a) Projections of the spin pole (red curve) and orbital pole (green curve) of Phobos during one precession period of 2.32 years. The blue cross and black point indicate the initial conditions for the spin and orbital poles. The difference between the two curves corresponds to the instantaneous obliquity oscillations that oscillates with larger amplitudes than the value of the mean obliquity (see text for details).

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