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   Gives the spectrum for radiation using conventional names.
   If you enter no inputs it will give you a table of the names and wavelength 
   ranges.
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   Form:
   lambda = Spectrum( band, n )
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   Inputs
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   band           (1,;) Name of band
   n              (1,1) Number of elements, default is 100

   -------
   Outputs
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   lambda         (1,:)  Wavelengths

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