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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > k line

k line comparison table

Subject	has specie	has definition	is a kind of	has wavelength
absorption line		Dark 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
k line	Mg II	Singly ionized magnesium resonance line.	absorption line	2795.5 Å

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