(a) ROSAT all-sky map showing the large-scale diffuse emission of the North Polar Spur and the location of the XMM-Newton pointings, i.e. the small green circle. The red, green and blue colours represent the 0.11-0.28 keV, 0.47-1.21 keV and 0.76-2.04 keV energy bands, respectively. (b) Image of the XMM-Newton FoV, showing both Region 1 and Region 2 (solid circles), and 1LHAASO J1740+0948u (dashed circles). The plotted radii of the source are taken from the 1 σ extension of the Gaussian (R_G,LHAASO) and the diffuse (R_D,LHAASO) models for photon energy above 25 TeV, shown in LHAASO Collaboration (2025). The 0.5-1 keV band is shown in red, the green emission corresponds to the range 1-2 keV, and the range 2-4.5 keV is represented in blue. Note that the observed point sources were later removed during the diffuse emission analysis.