Profiles of the measured thermodynamic properties. Top: projected temperature profile; bottom: emission measure (EM = ∫n_en_HdV) profile. The grey crosses show measurements presented in Urban et al. (2014), using a shallower data set. The colored bands show the systematic uncertainties of the measurements due to the Milky Way foreground and the CXB (see Sect. 3.2 for details). Further systematic uncertainties due to the assumed metallicity and atomic code are shown with red and orange lines, respectively.