Upper panel: redshift distribution of the spectroscopically confirmed cluster galaxies with velocities within ±3000 km s⁻¹ from the median cluster redshift, z = 0.4436 (black dashed line). Bottom panel: magnitude distribution for the cluster galaxies in the F160W band. The light-blue filled histogram shows the distribution of all 197 cluster members in our catalog, while the magenta histogram refers to the 46 spectroscopically confirmed members. The magnitude distribution of the 15 cluster members for which we could measure the velocity dispersion is given by the blue histogram.