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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > set of lines > lambda doublet

lambda doublet comparison table

Subject	has specie	is a kind of	has definition
set of lines		spectral feature	A set of absorption or emission lines in the spectra of a celestial object
lambda doublet	OH	set of lines	Two lines in the microwave region of the spectrum of the OH molecule caused by splitting of electronic levels.

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