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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line > Brackett line
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Brackett 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
Br alpha4hydrogen (H I) radiation unit   40512 Å  Brackett line

Next hydrogen lineLyman line    Uphydrogen line, spectral series line    Previous hydrogen lineBalmer line