Background-subtracted light curves of Sgr A* for the August 31, 2019, observation (Obs.ID 0831801201), shown separately for MOS1, MOS2, and PN. Counts per bin are plotted for the soft (2−5 keV) and hard (5−10 keV) bands using 50 s and 100 s binning. Horizontal dashed lines indicate baseline levels, while dotted and dash-dotted lines show the 3σ and 5σ thresholds. Shaded regions highlight narrow substructures near 9600 s (hard band) and 10 900 s (soft band), with their central times marked by vertical lines. Bins with jump significances exceeding 3σ are indicated.