Ratio between the density profiles obtained using 2D and 3D temperature profiles. Top panel: The density profiles are derived from the XMM-Newton surface brightness extracted in the [0.3−2] keV energy band. the effect of using 2D profiles is negligible. The three highest redshift clusters, shown with dotted lines, are not included in the computation of the median, mean and their dispersion (see text for details). Bottom panel: profiles are obtained from surface brightness profiles extracted in the [2−5] keV band. Here it is important to use 3D profiles since the surface brightness is particularly sensitive to the temperature. Legend as in Fig. 1 except that horizontal dotted lines represent the ± 2% levels. As in the upper panel, the three highest redshift clusters are not included in the computation.