Spatial and velocity distributions. Top panel: radial profile of the galaxies with spectroscopic redshift within 3000 km s⁻¹ of CL2015’s redshift. Bottom panel: velocity distribution of the same galaxies. In both panels, the solid line is the mean model fitted to the individual galaxy data in the r − v plane, while the shading indicates the 68% uncertainty (highest posterior density interval). Points and approximated error bars are derived by ignoring the velocity (top panel) or radial (bottom panel) information, binning galaxies in velocity bins, and adopting approximated Poisson errors, as is commonly found in the literature.