Fig. 7.
Evolution with inclination of the height contrast between rotational components with azimuthal orders 0 and ±1. The blue line represents the contrast ⟨P0⟩/⟨P±1⟩ computed from Eq. (12), while the red line represents the contrast ⟨P±1⟩/⟨P0⟩. Vertical dashed lines indicate inclinations of 45 and 64°, while the horizontal dot-dashed line indicates a height contrast of 2.
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