Left panel: MZR for 76 MAC0416 cluster members (Zgals sample, blue symbols) and 93 field galaxies (green symbols) at z ~ 0.4. Polynomial fits to the data points (blue and green thick lines) show that the MZRs for cluster and field galaxies are similar at intermediate masses M_med, where the Zgals sample has a uniform coverage with respect to the parent sample (see Fig. 1). Right panel: median values of MZR at z ~ 0.4 are shown in blue (cluster) and green (field), with the corresponding dashed oblique lines enclosing 68% of the data. In both panels we extrapolated the MZR of the SDSS sample to lower stellar masses by assuming that the slope of the low-mass MZR stays constant for log (M/M_⊙) < 9.2.