Top: Chandra 0.3–7 keV light curve for the nucleus from July 29, 2000 (MJD 51754), to March 17, 2016 (MJD 57464). Five flares (red data points, labelled 1–5) are selected for further analysis in the following. Bottom: zoomed-in light curves of the five flares. The solid lines show the fitting results by using Eq. (1).
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