#spectrum  an ordered array of the components of an emission or wave
  supertype:  #array  an orderly arrangement: "an array of troops in battle order"
  subtype:  #absorption_spectrum  #action_spectrum  #electromagnetic_spectrum  #emission_spectrum  #infrared_spectrum  #line_spectrum  #microwave_spectrum  #radio_spectrum  #sound_spectrum  #ultraviolet_spectrum  #visible_spectrum
  part:  #spectrum_line  an isolated component of a spectrum formed by radiation at a uniform frequency

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