Fig. 6
Lomb normalized periodogram (LNP) of the UV light curve. The grey line is the LNP of the OM light curve. The dashed and dotted lines are the average value and the 3σ upper threshold of the LNP of red noise with power-law index of 1.39. The vertical dashed-dotted lines indicate the frequency associated with our observing set-up and harmonic values (n = 2, 3, 4).
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