Top: cumulative projected total mass profiles for the Custer-1 mock as a function of the projected distance from the BCG. The red line corresponds to the true mass profile. The solid black line is obtained from the best-fit BAYESLENS model. The projected distances of the multiple images from the BCG center are shown as vertical black lines. Bottom: relative variation of the BAYESLENS total mass profile with respect to the true mass profile of the mock cluster. The dashed blue line in the bottom panel indicates a 2% relative difference between the mock and model mass profiles. In both panels, the gray shaded stripes delimit the 16th–84th percentiles of the mass profiles with parameters drawn from the posterior.