Values of for the clusters in the reference sample with respect to the reference scaling relation. We distinguish the results from the various lensing works used to build the CoMaLit sample with different colour markers. The number of clusters used in the reference sample from each of the works is indicated in brackets. For works with multiple clusters, we give the mean and the 16th to 84th percentiles over all those clusters. Grey shaded areas indicate 1σ and 2σ regions.