Relative contribution between source emission and background components in the outskirts of MKW3s. Black data are the XMM-Newton/MOS 2 spectrum, extracted from the ring with r = 10′−12′ (i.e. 0.57 − 0.68 R₅₀₀). Yellow is used to highlight the best-fitting model for the source emission; the Fe L-shell blend is visible at ∼1 keV. Red, green, light blue, and purple are used to mark the LHB, the GH, the NPS, and the CXB, estimated from the region named bkg1. Dotted lines are the model adopted to describe the particle-induced background, which includes power laws and Gaussian lines. The solid black lines show the resulting model for the X-ray sky components (i.e. the source plus the XRB) and the particle-induced background.