Density contrast Δρ = ρ/ρ_m vs. clustercentric distance for A2065 (left panel) and for A2061 (rich panel). The density contrast for the centre cluster is plotted with the red line. The golden area shows the error corridor from the mass errors. Characteristic density contrasts are denoted as follows: Δρ = 360 (virial), Δρ = 200 (r₂₀₀), Δρ = 13.1 (turnaround, dashed blue line), Δρ = 8.73 (FC, dash-dotted violet line), and Δρ = 5.41 (ZG, solid light blue line). Blue, light blue, and grey areas mark the borders of the turnaround, FC, and ZG regions. The red area marks R₃₀. The arrow in the right panel marks the average distance of cluster A2067 from the centre of A2061.