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Keywords: SpectroscopyResearch 020.jpg As the photograph is a positive print black denotes absorption Note the white features resembling broad emission lines These are actually discrete lacks of absorption Lines below the print shoe position of series components National Institute of Standards and Technology 10/6/1965 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Spectroscopy |