Coadded spectrum of the halo region (black) compared to the corresponding local background (red), extracted from the 16 Chandra observations. A weak but systematic excess is visible in the 2–6 keV band, consistent with the hotter (kT ≃ 3.5 keV) component inferred from the XMM-Newton analysis (Table 2). The spectrum is shown without background subtraction to illustrate the level of the excess relative to the local background.