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Fig. 5
Panels a–c: Effective temperature ratios 
as a function of η and different values k and α when Υ(θ) = coskθ. Panels d–f: Same for Υ(θ) = sinkθ and for the same values of k as before, but for α′ = − α/ (1 + α) where α is the same as in (a) to (c). The black-dashed lines correspond to the classic von Zeipel approximation.
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