Weak-lensing masses versus X-ray luminosities using the EXCPRES clusters (black boxes) combined with the stacked clusters and groups of Rykoff et al. (2008) (green circles) and of Leauthaud et al. (2010) (red crosses). The solid lines show the best BCES fit and the corresponding intrinsic dispersion for the three data sets. For comparison, the BCES best fit obtained with only the EXCPRES weak lensing subsample is plotted (dashed line).