Comparison with the composite of intermediately strong [CIII] emitters (Sample B; yellow-filled square) and the two best-fit models (magenta open diamond and orange open square). The two best fit models are provided by POPSTAR+AGN models with AGN contribution of f_AGN = 0.06–0.1, fixing the C/O abundance ratio to the solar value log C/O = −0.3. The magenta symbol corresponds to the low-Z branch solution of Z ~ 0.02 Z_⊙, and the orange to the high-Z branch solution of Z ~ 0.2 Z_⊙. The crosses are the same as in Fig. 15. The individual objects in Sample B are also plotted (symbols as in Fig. 14).