MUSE spectroscopic redshift distribution of the objects with a QF ≥ 2 identified in the SDSS 2222 cluster field. The top-left inset shows a zoomed-in view around the cluster redshift z = 0.489, as shown by the mean value of the Gaussian distribution (in orange). The vertical dashed black lines locate the redshift interval [0.474–0.504], which includes the 34 spectroscopically confirmed MUSE cluster members. The top-right inset shows the distribution of cluster members as a function of their magnitudes in the F160W HST band. The same colour code as in Fig. 1 is adopted. The multiple images are marked in grey.