Galaxy stellar mass function at different redshifts, as indicated in each panel, for galaxies in G&C with different X-luminosities and in the field (black diamonds). High X-ray luminosity G&C members () are plotted in red; low X-ray luminosity G&C members are plotted in green. Only points above the mass completeness limit are shown. Error bars on the x-axis show the width of the mass bins; those on the y-axis are derived from Poisson’s statistics on the number counts together with the cosmic variance contribution. Due to low number statistics of the sample, we do not show the redshift bin 0.4 ≤ z ≤ 0.6. At z ≥ 0.3, fixed values for the faint end slope α were set in order to perform Schechter fits.