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   Outputs the frequencies for specified bands of electromagnetic radiation.

   Type Frequency for a demo.
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   Form:
   f = Frequency( band, new )
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   ------
   Inputs
   ------
   band      (1,:)  Band, for example 'uhf', 'visible'
   new       (1,1)  Use new bands, i.e. 'a', 'b'

   -------
   Outputs
   -------
   f          (:)    Frequency (Hz)

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