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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > ionized helium line > ionized helium Lyman line
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ionized helium Lyman line comparison table
Subject has lower energy level has specie has equivalent width has unit has value occurs in has series limit has wavelength has transition has width is an instance of
He II Lyman alpha1ionized helium (He II) radiation unit  227 Å303.78 Å  ionized helium Lyman line

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