Upper plot: Galaxy stellar mass distributions of star-forming galaxies in the field (squares), low-mass groups (black points) and high-mass groups (magenta triangles). Different panels show different redshift bins. In each panel the vertical line marks the completeness stellar mass. The distributions are normalized to their respective overdensity δ (over the critical one) at the redshift considered. The values of δ used are 200 for the groups, while we assumed an overdensity of 1 for the field. Lower plot: same as the upper panel but for passive galaxies.