Fig. 4.
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Power spectrum and mean light curve in 2020. Top panel is the power spectrum of SRGA J213151.5+491400 derived from the entire ground-based photometric light curve in 2020 July–October (high state). The detected period is labeled on the figure. The bottom panel shows the mean light curve derived from the same data set in 2020 during the high state. The phases on the x-axis are with respect to the Tmin of the Ephemerides.
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