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Fig. 3.

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Period search results. Top: CLEAN periodogram analysis of the ugri′ light curves. A peak occurs at the frequency of 0.166 day−1, which corresponds to a period of 6.04 ± 0.15 days. Bottom: string-length analysis of the ugri′ light curves. A clear minimum appears for a period of 6.03 ± 0.15 days.

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