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   Noise temperature of the Moon. Constant at 250 deg-K.
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   Form:
   t = TMoon( f )
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   ------
   Inputs
   ------
   f             (1,:)  Frequency (GHz)
                        
   -------
   Outputs
   -------
   t             (1,:)  Moon noise temperature (deg-K)
                        
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	References:	Maral, G. and M. Bousquet. (1998.) Satellite Communications
               Systems. Wiley. pp. 37.
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