Mass and redshift of known high-redshift (z >  0.5) clusters in the SDSS footprint. Orange circles represent ComPRASS candidates that have been associated to a PSZ2 cluster at z >  0.5. Blue circles represent ComPRASS candidates that have been associated to other z >  0.5 clusters. Empty circles represent PSZ2 clusters at z >  0.5 that are not included in the ComPRASS catalogue. Smaller grey circles show ComPRASS candidates confirmed at z <  0.5. The mass represented in the figure corresponds to the joint mass estimated by the X-ray–SZ method for the grey, orange, and blue circles; and to the published mass in the PSZ2 catalogue for the empty circles.