Relative contribution of potential density and temperature-related systematic uncertainties to the median entropy profile. We show the ratios between the medians $\stackrel{\sim }{K}$ of the scaled entropy profiles, reconstructed using: (i) median and mean densities, without cut for S/B > 0.2 (grey); (ii) mean densities, with and without cut for S/B > 0.2 (purple) and (iii) a combination of the two (red), as detailed in the text. Shaded areas are the 1σ statistical errors.