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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > emission line > main lines

main lines
subject			fact

main lines	has definition The transitions that emit radiation at 1665 and 1667 mhz of an OH source.
	is a kind of emission line
emission line	has antonym absorption line
spectral line	has transition
	has equivalent width
spectral feature	has wavelength
	has width
	occurs in
	has species
radiation measurement	has unit radiation unit
number	has value