Fig. 13
Phase-folded curve of the data for the B, V, and R filter time series using the 74-day periodicity. The grey dots are the individual measurements after subtracting the long-term variations. The red dots are the same points binned in phase with a bin size of 0.1. The error bar of a given bin is estimated using the weighted standard deviation of binned measurements divided by the square root of the number of measurements included in this bin. The blue solid line shows the best fit to the data using a double harmonic sinusoidal fit.
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