Fig. 4.
Histograms of the Gaia DR2 amplitude for Mira and SRa/SRb periodic variables of the General Catalogue of Variable Stars (Samus et al. 2017). The Gaia amplitude has been defined by Deason et al. (2017) and combines the Gaia G flux, its fluctuations, and the number of measurements (see Sect. 3.1, 2nd paragraph). The Gaia amplitude histogram is plotted in log here.
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