Vacuum wavelength ranges adopted for index definition.
|Indicator||Target||Reference 1||Reference 2|
|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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