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Table 1.
Definitions of line ratios adopted throughout the paper.
| Diagnostics | Line ratio |
|---|---|
| R2 | [O II]λλ3727,29/Hβ |
| R3 | [O III]λ5007/Hβ |
| N2 | [N II]λ6584/Hα |
| S2 | [S II]λλ6717,31/Hα |
| R23 | ([O II]λλ3727,29 + [O III]λλ4959, 5007)/Hβ |
| R̂ | 0.47 × log10(R2) + 0.88 × log10(R3) |
| O32 | [O III]λ5007/[O II]λλ3727,29 |
| Ne3O2 | [Ne III]λ3869/[O II]λλ3727,29 |
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