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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > emission line > forbidden line > [O III] line > N2 line

N2 line comparison table

Subject	has specie	has definition	is a kind of	has wavelength	is an instance of
[O III] line			forbidden line
N2 line	[O III]	Green forbidden line of doubly ionized oxygen.		4959 Å	[O III] line

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