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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > absorption line > K I doublet
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K I doublet 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 I doubletpotassium (K I) absorption line7699 and 7644 Å

Next absorption linek line    Upabsorption line    Previous absorption lineinterstellar line