Ratio between the caustic and true mass profiles of the simulated clusters for three different redshifts, z = 0.01, 0.52, and 1.04 (left to right). The solid black curve in each panel shows the median radial profile of the mass ratios. The blue area shows the interquartile range. The black dashed line shows M^C(r) = M^3D(r). We scale the caustic and true profiles by and , respectively.