Surface-brightness distribution of MRG-M0138. Top and middle panels: Observed (top panel) and model-predicted (middle panel) surface-brightness distribution of SNe Requiem and Encore host galaxy, MRG-M0138, from our best-fitting reference lens model. The colour images were created through a combination of three JWST filters (F115W, F200W, and F444W) with a pixel size of $0\stackrel{″}{.}04$. The green region encloses the pixels used in the forward modelling optimisation. Bottom panel: Normalised residuals in the F115W band within the green region shown in the top panel in a range between −20σ and 20σ.