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   Computes the peak black body wavelength as a function of temperature.
   This function has a built-in demo.
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   Form:
   lambda = WiensDsp( T )
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   Inputs
   ------
   T            (1,:) Temperatures (deg-K)

   -------
   Outputs
   -------
   lambda       (1,:) Wavelength vector (µmeters)

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   References:	Thomas, L. C., Heat Transfer, Prentice-Hall, 1992, p. 266 
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