Star-forming galaxy (SFG) models from Gutkin et al. (2016) and AGN models from Plat et al. (in prep.) in the OHNO diagram. The dashed black demarcation line is from Feuillet et al. (2024), while the solid black line is from Arevalo-Gonzalez et al. (2025). Stacked measurements are shown as purple (weak stack), light green (strong stack), and pink (no C III] stack) points. The C III] emitters with a broad Hα are plotted as red diamonds. The values for RUBIES-15072 (outside the plot range) are log₁₀([Ne III] λ3869/[O II] λλ3726,3279) = 2.22 and log₁₀([O III]/Hβ) = 0.83 ± 0.08.