Light curve of the 2022 outburst. Each point in panels 1, 2, 3, and 4 (from top to bottom) represents the persistent rate with the binsize of 12 h for NICER (1.0–10.0 keV), LE (2.0–10.0 keV), ME (10.0–30.0 keV), and HE (30.0–100.0 keV), respectively. The locations of type-I bursts are shown with the vertical solid lines; black and red lines represent the observations of Insight-HXMT and NICER, respectively. Panel 5 represents the evolution of the hardness calculated as the ratio between the ME rate and the NICER rate.