Mean weighted abundance in our XMM-Newton sample as a function of the redshift for the clusters in our sample in different spatial bins: 0–0.15 r₅₀₀ plotted in red, 0.15–0.4 r₅₀₀ in green, and  > 0.4r₅₀₀ in blue. The error bars represent the error in the mean and are listed in Table 5. The cyan points represent the weighted abundance measured by MAU08 for a sample of 116 clusters. The abundance values expected at different redshifts in the Ettori (2005) model are plotted as a solid black line.