Color composite HST image of PSZ1-G311 with the contours of the MUSE pointing marked in white. The 197 cluster members selected in the final catalog are marked with red circles if photometrically identified (151 members), in cyan if spectroscopically confirmed (46 members), and in green (15 members) when we can measure their stellar velocity dispersion () from the MUSE spectra. The BCG is encircled in orange.