BLAGN at z>4 are distinguished by [NeIII]/[OII], but the full [OIII]/Hgamma versus [NeIII]/[OII] diagram is contaminated by about 40% non-broad-line galaxies, so it cannot robustly separate AGN from star-forming galaxies.
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Emission-Line Diagnostics at z>4: [OIII]{\lambda}4363/H\gamma
BLAGN at z>4 are distinguished by [NeIII]/[OII], but the full [OIII]/Hgamma versus [NeIII]/[OII] diagram is contaminated by about 40% non-broad-line galaxies, so it cannot robustly separate AGN from star-forming galaxies.