Fig. 6

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Lomb-Scargle periodogram for SRGt 062340.2–265751, showing a clear isolated peak around 3.941 h. The dotted line shows the periodogram level corresponding to a maximum peak false-alarm probability of 1% using the bootstrap method that simulates data at the same observation times to approximate the true distribution of peak maxima for the case without a periodic signal. The bootstrap method is performed with periods between 0.1 and 0.5 days and after normalizing by the residuals of the data around a constant reference model.

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