Fig. 6.

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V-filter brightness from AAVSO Vollmann’s data and Gaia data. The solid green line shows a running mean of 300 days, and the light grey shading corresponds to the standard deviation of the running mean. In the lower figure we show the residuals of the mean level that illustrate the amplitudes of short-term fluctuations, which vary between 0.05–0.13 mag.
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