Light curves and hardness ratio for XRISM/Resolve (light blue) and Xtend (green), XMM-Newton/EPIC-pn (orange), and NuSTAR/FPMA (red) and FPMB (blue) with a time resolution of P = 283.595 s. Top panel: Overall count rates in the energy bands corresponding to the respective instruments. The black dashed vertical lines denote the two GTIs we chose for our spectral analysis (Sect. 3.2 and Sect. 3.3). The dash-dotted light blue line marks the end of the FW electronics error, i.e. the beginning of the well-calibrated XRISM/Resolve data for our spectral analysis (Sect. 3.4). Bottom panel: Hardness ratio between the 0.5–3 keV (soft) and 8–10 keV (hard) energy bands.