Relation between AMICO amplitude, A, and X-ray luminosity on which the X-ray mass estimates are based (albeit with a redshift-dependent correction). The grey points were rejected from this analysis because they are either heavily masked (more than 30% of the cluster) or their X-ray flux is possibly contaminated by an interloper. Only the systems with a significance of X-ray flux estimate above the 1σ significance are shown. The left and right panel refers to optical detections with S/N > 2.5 and S/N > 3.0, respectively.