Variations in the frequencies of two l = 2 rotational multiplets during an avoided crossing. The sequence of models B0 through B8 was used, assuming the rotation profile given by Eq. (15) with a core-envelope contrast of five. The frequencies of rotational multiplets were computed using the first-order pertubative approach including near-degeneracy effects (open blue circles), and using the non-perturbative oscillation code acor (solid and dashed black curves). The filled red circles correspond to the frequencies obtained with the approximate Eq. (24) for model B4.
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