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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > b-lines
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b-lines comparison table
Subject has definition is a kind of has wavelength
absorption lineDark line superposed on a continuous spectrum, caused by the absorption of light passing through a gas of lower temperature than the continuum light source.spectral line 
b-linesA triplet of spectral lines of Mg I.absorption lineλλ 5167-5184 Å

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