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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > Fraunhofer line > D line > D2 line

D2 line comparison table

Subject	has definition	is a kind of	has wavelength
D line	Spectral line of neutral sodium, also the strongest interstellar line.	interstellar line
D2 line	Spectral line of neutral sodium.	D line	5890 Å

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