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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > emission line > main lines

main lines comparison table

Subject	has definition	is a kind of
emission line	Bright lines produced in a spectrum by a luminous source, such as a star or a bright nebula.	spectral line
main lines	The transitions that emit radiation at 1665 and 1667 mhz of an OH source.	emission line

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