Probability distribution functions for the positions of the observed and model-predicted multiples images of SN Encore (system 1, top) and SN Requiem (system 2, bottom), in arcsec with respect to our reference position (associated with the BCG). The filled histograms correspond to the marginalised probability distributions obtained from the best-fitting reference lens model, from 1000 different models randomly extracted from the MCMC chain. The solid and dashed black lines correspond to the 50th and the 16th and 84th percentiles of the marginalised distributions, and the corresponding values are reported at the top of each panel. The gold vertical lines in some of the panels denote the observed positions of the multiple images, and the shaded region shows the circularised positional uncertainties. The predicted median values from the lens models circularBCGout, ellipticalBCGout, reference-noFG, reference-subs, and subs-noES are shown with purple, green, cyan, gold, and lime triangles, respectively.