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Table 3
Diagnostic line ratios used to compute the electron temperature and density simultaneously.
| Ionisation zone | Temperature diagnostic | Density diagnostic |
|---|---|---|
| Low | [N II] λ 5755/6548 | [S II] λ 6716/6731 |
| High | [S III] λ 6312/9069 | [Cl III] λ 5518/5538 |
| [Ar III] λ 5192/7136 | [Cl III] λ 5518/5538 | |
| Very High | [Ar IV] λ 4740/7170 | [Cl III] λ 5518/5538 |
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