Projected density maps (see color bar) of candidate cluster members for the five clusters. Gray empty symbols show the position of individual candidate members, where symbol size scales with the galaxy statistical background subtraction weight (Sect. 3.2), and symbol shape reflects galaxy morphology. The cross marks the coordinates of the SPT-SZ detection, with the cross size showing the estimated positional uncertainty (1σ, see Sect. 3.4). The position of the adopted brightest central galaxy, defining the cluster center in the subsequent analysis, is indicated by a star. The circle is centered at the median coordinates of the 5% highest-density points in the map, and has a radius of 250 kpc at the cluster redshift (for comparison r₅₀₀ ∼ 70″ ∼ 600 kpc for these clusters). Masked areas are blanked out and white gridding marks areas affected by edge effects.