Ne3O2 vs. stellar mass for individual HALO7D galaxies (green circles) and composite HALO7D spectra (blue circles) compared with z ∼ 2 individual and composite measurements from J20 (red diamonds), local SDSS composite measurements from AM13 (purple triangles), and local low-mass individual detections (light blue triangles) and composite measures (blue triangles) from LVL. Measurements of three z > 7 galaxies are shown as crimson stars (Schaerer et al. 2022). Composite HALO7D spectra have lower Ne3O2 compared to the median individual detection at fixed stellar mass, suggesting the individual detections have higher excitation than the average for their mass and redshift. This relation holds in the z ∼ 2 and z ∼ 0 samples as well. Composite HALO7D spectra have similar Ne3O2 to z ∼ 0 stacks at low mass, indicating that the Ne3O2 behavior does not evolve substantially from z ∼ 1 to z ∼ 0. The median error of individual HALO7D galaxies is given in black in the lower left.