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Fig. 6.

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Amplitude (top) and phase (bottom) variability of the combination frequency ν5 = ν2 + ν3 (blue circles), measured from the out-of-eclipse residual light curve, as a function of the orbital phase. These are compared with the relative amplitude scaling factor A2 ⋅ A3 and the sum of the parent frequency phases ϕ2 + ϕ3 (red downward triangles; e.g. Buchler et al. 1997; Vuille & Brassard 2000).

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