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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line > Lyman line | 
| Lyman line comparison table | |||
| Subject | has upper energy level | has definition | has wavelength | 
|---|---|---|---|
| Lyman alpha | 2 | The resonance line of hydrogen. It can only be studied from spacecraft or in the spectra of highly redshifted quasars. | 1215.67 Å | 
| Lyman beta | 3 | 1026 Å | 
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