Multi-wavelength SED and best-fit single-zones models. Panel A: The flux points and upper limits follow those of Figure 3. The XRISM flux region (scaled to the H.E.S.S. emission region size) is depicted with a grey shaded region. The Fermi-LAT points are shown both as published in Zhao et al. (2025) (light triangles) and re-scaled to the H.E.S.S. emission region size (dark triangles). The solid lines show the prediction of the best-fit leptonic model for different assumptions of t_inj. Panel B: The flux point symbols follow those of panel A. The black solid line shows the prediction of the best-fit hadronic model. The model obtained by fitting with a fixed Γ_p = 2 is shown with a grey dotted line for reference. Panels C and D: The residuals between the data and the best-fit models. In the leptonic case, colours indicate the model and symbols the dataset.