Observational properties of the sample and distribution of the AMICO galaxy members. Upper-left panel: redshift–magnitude diagram for the whole sample colour coded according to the probabilistic association, P_assoc. Middle-left panel: redshift distribution. Bottom panel: r_SDSS (MAG_AUTO) distribution. Here we show the galaxies in a group environment (black line), and galaxies in the field (grey histograms). The distributions of the full miniJPAS sample of galaxies are also shown (light grey histograms). Right panel: contours show the density galaxy map distribution of the whole miniJPAS sample analysed here. The points show the distribution of galaxies in groups; the circles are the brightest and most massive galaxy of each AMICO group. Points are coloured according to photo-z.