Fig. 4
Zoom of the light curve of KIC 8561221 (top) and ACF of this part of the light curve. The position of maximum of the ACF, 93.0 days, is marked by a vertical red dashed line in the bottom panel. The red-dashed lines in the light curve (top panel) are the corresponding period intervals, which match the repeating flux modulations. The ends of each quarter are indicated by the blue dotted lines.
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