Central intersect oxygen abundance (O/H)_{0, intersect} as a function of the distance (look back time). Panel a: Central intersect oxygen abundance as a function of the distance (look back time) for galaxies with masses 10.5 < log(M_⋆/M_⊙) < 10.9. The grey circles denote the abundances in individual galaxies, the red circles mark the median values of the abundances for galaxies in bins of 50 Mpc in the distance, and the bars show the scatter in the abundances about the median value in the bins. The line is the median value of abundances for all galaxies from this mass interval. Panel b: The same as panel (a) but for galaxies with masses 10.9 < log(M_⋆/M_⊙) < 11.3.