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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > emission line > forbidden line | 
| forbidden line comparison table | |||||||||||
| Subject | has specie | has equivalent width | has unit | has value | occurs in | has synonym | is a kind of | has wavelength | has transition | has width | has antonym | 
|---|---|---|---|---|---|---|---|---|---|---|---|
| [O III] line | radiation unit | nebular line | forbidden line | absorption line | 
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