Line flux ratios of the z = 9 sample, with [O III] λ4363 detections in hot pink, and 3σ upper limits in pale pink. The light blue points show z ≈ 0 galaxies with [O III] λ4363 detections from from SDSS-DR15, for comparison. The dark blue points represent SDSS objects that lie in the AGN region of the [N II]/Hα Kauffmann et al. (2003) BPT diagram. Dashed lines represent AGN diagnostics utilising the [O III] auroral line from Mazzolari et al. (2024), calibrated using local and high-z samples of SFGs and AGNs.