2D and 1D distributions of the displacements Δ_i, along x and y directions, between the observed and model-predicted positions of the 182 multiple images used to constrain the LM-4HALOS lens model, and corresponding Δ_rms values (see Eq. (5)). The 125 images in the north field and the 57 in the south are shown separately as red and green dots, respectively (see the dividing line between the NE and SW regions in Fig. 8).