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Table 3
Vacuum wavelength ranges adopted for index definition.
| Indicator | Target | Reference 1 | Reference 2 |
|---|---|---|---|
| [Å] | [Å] | [Å] | |
| Hα Index | 6562–6567 | 6550–6555 | 6570–6575 |
| Hα Broad | 6550–6575 | 6520–6545 | 6580–6605 |
| Hα BWI | 6558–6563 | 6540–6545 | 6580–6585 |
| Hα RWI | 6566–6571 | 6540–6545 | 6580–6585 |
| Hα BWI-e | 6556–6561 | 6540–6545 | 6580–6585 |
| Hα RWI-e | 6568–6573 | 6540–6545 | 6580–6585 |
| He I D3 | 5875–5880 | 5869–5874 | 5905–5910 |
| Na I D2 | 5889–5894 | 5869–5874 | 5905–5910 |
| Na I D1 | 5896–5901 | 5869–5874 | 5905–5910 |
| Ca II IRT | 8497.5–8502.5 | 8490–8495 | 8505–8510 |
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