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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > b-lines

b-lines
subject			fact

b-lines	has wavelength λλ 5167-5184 Å
	has definition A triplet of spectral lines of Mg I.
	is a kind of absorption line
absorption line	has antonym emission line
spectral line	has transition
	has equivalent width
spectral feature	has width
	occurs in
	has species
radiation measurement	has unit radiation unit
number	has value