Zoomed RGB image of the PSZ2 G079.36+38.06. This cluster is one of the richest in our dataset, with more than 300 photometric members, 53 of them confirmed through spectroscopy at z_spec = 0.299. The observed galaxies are grouped in several clumps (marked as blue circles) and distributed across the FOV (∼11′×19′) of the optical image. Top-left panel: MILCA y-map with black contours corresponding to the 3 and 6×10⁻⁶ levels of the y-map in this area (in the RGB image the same contours are represented as green lines). The red circles in both images correspond to the nominal Planck position.