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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line > Brackett line > Br alpha | 
| Br alpha comparison table | |||
| Subject | is a kind of | has wavelength | is an instance of | 
|---|---|---|---|
| Brackett line | hydrogen line | ||
| Br alpha | 40512 Å | Brackett line | 
 Up: Brackett line