The evolutionary track as predicted by models with continuous SF. From top to bottom, panels show log(C/O) vs. 12 + log(O/H), [O/Fe] vs. [Fe/H], and the μ − Z relation; from left to right columns are for the cases of no wind, normal wind, and metal-enhanced wind (w_H,   He = 0.3). Models with different SFEs are shown in each case: solid black lines for ϵ = 0.5   (d = 2), dash-dotted magenta lines for ϵ = 0.2   (d = 5), long-dashed blue lines for ϵ = 0.1   (d = 7), dashed red lines for ϵ = 0.05   (d = 9), and dotted black lines for ϵ = 0.02   (d = 13). The total infall masses are assumed to be M_inf = 10⁹ M_⊙ in all these models. The observational data are the same as in Figs. 2 and 3, BCDs, dIrrs, and DLAs are plotted in open cyan circles, open cyan triangles, and open green squares, respectively.