Comparison with the composite of strong [CIII] emitters (Sample A; yellow-filled circle) and the two best fit models (red open diamond and orange open square). The models are provided by the POPSTAR+AGN model with the AGN contribution of f_AGN = 0.08, fixing the C/O abundance ratio to log C/O =−0.45. The magenta and orange symbols show the low-Z and high-Z branch solution, respectively, as shown in the legend. The crosses are the same as in Fig. 15. The individual objects in Sample A are also plotted (same symbols as Fig. 14). Objects that are diagnosed to be AGN-powered with the UV diagrams but not X-ray detected are marked with a red dagger.