Baldwin-Phillips-Televich diagram for the MQN01 galaxy sample. The classification curve is from Kewley et al. (2013) with z = 3.245. Galaxies are shown as blue stars. For one galaxy (ID: 6005) without an Hβ detection, a 3σ upper limit is adopted, resulting in a lower limit for [OIII]λ5008/Hβ, shown as a blue triangle. The galaxy whose [OIII] falls within the spectrum detection gap (ID: 3201, see Fig. B.1) is shown as the vertical dashed line at its [NII]λ6585/Hα value. The distribution of the stacked CEERS 2.7 < z < 4.0 sample (Shapley et al. 2023a), stacked MOSDEF z ∼ 2.2 (Sanders et al. 2021), and the best-fit relation for the KBSS-MOSFIRE sample at z ∼ 2.3 (Steidel et al. 2014) are also included.