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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > absorption edge > Helium discontinuity

Helium discontinuity comparison table

Subject	has specie	is a kind of	has definition
absorption edge		spectral feature	Sudden rises superposed on the smooth decrease of the curve of the attenuation coefficient, which cause the curve to have a typical sawtooth aspect. They generally occur at the limit of spectral lines.
Helium discontinuity	helium (He I)	absorption edge

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