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Table 1.
Definitions of line ratios adopted throughout the paper.
| Diagnostics | Line Ratio |
|---|---|
| R3 | [O III] λ5008/Hβ |
| N2 | [N II] λ6584/Hα |
| S2 | [S II] λλ6718,32/Hα |
| Ne3O2 | [Ne III] λ3869/[O II] λλ3727,29 |
| He2 | He IIλ4686/Hβ |
| C43 | C IVλλ1549,51/CIII]λλ1906,08 |
| C3He2 | C III] λλ1906,08/He IIλ1640 |
| Ne4C3 | [Ne IV] λλ2422,24/CIII]λλ1906,08 |
| Ne5C3 | [Ne V] λλ3427,29/CIII]λλ1906,08 |
| N5C3 | N Vλλ1239,42/CIII]λλ1906,08 |
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