Example model output from the best performing model shown in Table D.1. We note that the other models are qualitatively indistinguishable. The top-left panel shows the observed image, the top-middle panel shows the model-predicted reconstruction of the image, and top-right panel shows the fit’s residuals normalized by the estimated uncertainty of each pixel (see Appendix E for more details). At the bottom left is the reconstructed source plot, featuring more detail than any parametric source modeled for time-delay cosmography thus far. The star symbol denotes the location of the quasar host galaxy’s centroid. The bottom-middle panel shows the lensed unconvolved extended-source light, and the bottom-right panel shows the magnification map of the system.