Overview of all multiple-image systems used in this study. The most secure identifications, used to optimize the lens model in the image plane (65 images) are shown in red; in orange we highlight the systems with a spectroscopic redshift from either GMOS or MUSE, with larger green circles highlighting the background sources with a MUSE redshift. System #1 is split into 24 individual sources at the same redshift, not labelled on the figure for clarity (see Table 1 for their coordinates). The underlying colour image is a composite created from HST/ACS images in the F814W, F606W, and F435W passbands. Critical lines at z = 1.49 and 7.0 are shown in white. The green rectangle highlights the VLT/MUSE field of view. The top left-hand inset shows a close-up view of the northern component of the cluster (clump #4 in Table 5). North is up and east is left.