Core-excised [0.5–2] keV band X-ray luminosity vs. mass M₅₀₀. Left panel: black points are REXCESS (X-ray selected) clusters and use Y_X-based masses. The red line is the Malmquist- and selection-bias-corrected fit to the REXCESS X-ray selected sample, whereas the dashed lines mark the mean relation ±5σ_intr. The blue outlying point is CL2015. Right panel: open circles are XUCS clusters, the blue point is CL2015. The red line and the ±1σ corridor is a fit to this sample (Andreon et al. 2017).