Dependences of Ne3O2 = [Ne III] λ3868/[O II] λ3727 on (a) stellar masses M_⋆ and (b) the O₃₂ = [O III] λ5007/[O II] λ3727. The solid line in (b) is the maximum likelihood relation. The individual z ∼ 2 SFGs from the MOSDEF survey and stacks of MOSDEF spectra from Jeong et al. (2020) are shown by black-filled circles and green crosses, respectively. The meanings of symbols for CSFGs are the same as in Fig. 1.