Surface brightness profile fitting results of SE, S, and cold front (CF) regions. Upper panel: Chandra surface brightness. Lower panel: XMM-Newton surface brightness profile fitted by fixed and free C parameters. All XMM-Newton models are smoothed by a σ = 0.1′ Gaussian function. Red lines indicate the ratio between the subtracted FWC background counts and the remaining signal, which include the ICM, X-ray background, and soft proton contamination. In regions where this ratio is higher than one, the FWC background dominates. Black dashed lines are the radio surface brightness profiles in an arbitrary unit.