Test of the XMM-Newton PSF correction in the soft energy band: ratio between normalised density profiles obtained from the deprojection of Chandra and XMM-Newton surface brightness profiles. The error bars correspond to the error on the A2163 profile, and represent the typical uncertainties as a function of radius. Each profile is normalised by the density computed at R = 0.15 R₅₀₀ to assess shape differences. There is an excellent agreement between the profile shape above 5″, showing that the XMM-Newton PSF is properly accounted for in the density reconstruction. Legend as in Fig. 1 except that horizontal dotted lines represent ± 1% levels.