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Fig. 2


Solar elongation (upper panel) and modulation index (lower panel) of AO 0235+164 plotted versus observing time. The orange line shows the sum of the three variability components which correspond to the harmonics of the signal highlighted in the periodogram analysis in Fig. 3. The cyan line shows a sinusoidal fit obtained after removing the data-points corresponding to the two epochs at smallest solar elongation.

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