Prediction for system 1 based on the confirmed counterimage in Pignataro et al. (2021). Left and right panels: data and predictions respectively. Both morphology and parity are well reproduced by the lens model. The circles in the left panel mark the positions of the 4 knots identified in Pignataro et al. (2021). These circles are reproduced in the same position in the right panel, in order to better appreciate the offset between the predicted and the observed positions. Offsets of order 1″ are typical in free-form reconstructions, especially in regions of the lens plane where constraints are scarce. We note how the tangential magnification between knots 1 and 2 is smaller for the predicted images, while it is larger for knots 3 and 4. Unless noted otherwise, this and other color images are made with a combination of the F390W, F606W and F814W filters.