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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > emission line > forbidden line
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forbidden line comparison table
Subject has specie has equivalent width has unit has value occurs in has synonym is a kind of has wavelength has transition has width has antonym
[O III] line  radiation unit  nebular lineforbidden line   absorption line

Next emission lineinverse P Cygni line    Upemission line    Previous emission linecoronal green line