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| ionized helium Balmer 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 Balmer alpha |   | ionized helium (He II) |   | radiation unit |   |   |   | 1640 Å |   |   | ionized helium Balmer line | 
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