Density contrast Δρ = ρ/ρ_m versus clustercentric distance D_c for the SCl A2142 main body (red line). Golden area shows error corridor from mass errors. Characteristic density contrasts for the standard cosmological model are denoted as follows: Δρ = 360 (virial), Δρ = 200 (r₂₀₀), Δρ = 13.1 (turnaround, blue dashed line), Δρ = 8.73 (future collapse FC, magenta dash-dotted line), and Δρ = 5.41 (zero gravity ZG, light blue solid line). Tomato, blue, and light blue vertical areas mark borders of the HDC of the supercluster, turnaround region of the supercluster main body, and zero gravity region.