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Fig. A.1
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Minimum orbital inclination of a planet such that its obliquity can evolve from 0° to more than 90° over a single libration in a secular spin-orbit resonance. Conditions 1 and 2 are given in Eqs. (A.4) and (A.5), respectively. The minimum inclination is reached at 
and its value is given by tan 
.
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