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spectral purity
el.	Spektralreinheit f
opt.	Einfarbigkeit f (of the light); Reinheit des Spektrums (of the light); spektrale Reinheit (of the light); Spektralreinheit f (of the light)
piez.	spektrale Reinheit

spectral purity: 2 phrases in 1 subject

Optics branch of physics

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