Relative error on the average surface mass density Σ(< R) as a function of radius from the BCG for the multi-plane best-fit models of Mock mass distribution 2. Left: cluster halo only. Right: cluster members only. In each plot, the four lines represent the full multi-plane model (dashed magenta), the model where we assumed constant mass-to-light ratio (light blue), the model where we assumed spherical galaxies (red), and the model where we assumed only spherical cluster members (blue) as compared to the input simulated cluster (solid black).