Reconstructed 3D gravitational potential profiles obtained as outlined in Sect. 3.2 assuming spherical symmetry. Top panel: true potential (black curve); X-ray potential (using Eq. (5)) mean (green) and median (red); tSZ potential (using Eq. (6)) mean (blue) and median (cyan). Bottom panel: corresponding relative residuals. The vertical lines represent R₅₀₀ and R₂₀₀: (a) for the relaxed cluster CL135; (b) for the merging cluster CL77.