Stacked profile of the metallicity weighted by light (top panel) and mass (central panel) for late-type galaxies, scaled to the r-band half-light effective radius, as a function of the mass and the environment. Galaxies in groups are shown as red dots and lines, and field galaxies as blue dots and lines. Red symbols represent the median in each radial size bin for galaxies in groups. Vertical error bars were computed using the bootstrap re-sampling technique. The blue symbols show the mean value and its dispersion of the field galaxies for 50 randoms runs. Bottom panel: distribution of Hubble type as a function of environment and stellar mass. For field galaxies, we show the mean distribution for 50 randoms runs performed.