Completeness (C_pm) and purity (P_pm) of the sample of IR-emitting supercluster members selected on the basis of their z_p (0.166 ≤ z_p ≤ 0.290), as a function of f₂₄. C_pm and P_pm are estimated using the sample of 24 μm-emitters with both z and z_p available, and assuming the members selected on the basis of their z are all real members. The black X’s are for the total sample. The red dots, blue squares, green stars are for the core, filament, and outskirts subsamples, respectively (see Sect. 3.3 for the definition of these subsamples). Horizontal bars indicate the f₂₄ bin intervals. Vertical bars indicate 1-σ uncertainties.