2D mass maps for the different models explored here for MACS J1206. For clarity, we label these models only in the four top mass maps. The same labels apply in the four bottom maps. The size of each panel is 150″ × 105″, centred on the cD galaxy. Top: 2D mass distribution corresponding to the main DM halo + the B-spline perturbation, when included. Contours are 0.02, 0.03, 0.04, and 0.05 × 10¹² M_⊙ arcsec⁻². Bottom: individual galaxies added to the main DM halo and the perturbation. Contours are 0.02, 0.03, 0.04, and 0.08 × 10¹² M_⊙ arcsec⁻².