Metallicities and effective yields as a function of gas fraction for the galaxies in our sample at z ~ 3, with the same symbols as in the previous figures. In both panels the Erb (2008) models for various inflows f_i, outflows f_o rates (relative to the SFR) are shown. The dotted black line is the closed-box model (f_i = f_o = 0). In the bottom panel (lower-right corner), the inflows and outflows rates in units of the SFR are shown for every model (with different color-coding).