Comparison with previous literature. CONF-FGSs and CLs as in Fig. 3, but for the bolometric X-ray luminosity and the optical luminosity computed within 0.5R₂₀₀. The dashed line indicates overestimates by a factor of 10 in L_X(bol) or underestimates by a factor of 3 in L_opt with respect to our CL sample (red points fitted by the solid line). Large and small black triangles indicate the fossil and comparison systems in Harrison et al. (2012, see their Fig. 5).