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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > emission line > inverse P Cygni line
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inverse P Cygni line comparison table
Subject has definition is a kind of
emission lineBright lines produced in a spectrum by a luminous source, such as a star or a bright nebula.spectral line
inverse P Cygni lineAn emission line in which the emission is on the violet side of the absorption. It is usually interpreted to mean infall of matter.emission line

Next emission lineK alpha    Upemission line    Previous emission lineforbidden line