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   Computes the link attenuation due to precipation.
   Has a built-in demo for the 'K' zone.
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   Form:
   aRain = LossPrecipitation( f, zone, pTime, latitudeS, longitudeS, hS, rSC, tau )
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   ------
   Inputs
   ------
   f              (1,1)  Frequency (GHz)
   zone           (1,1)  Climate zone (A-Q)
   pTime          (1,1)  Precipation percentage of time
   latitudeS      (1,1)  Latitude of ground station (deg)
   longitudeS     (1,1)  Latitude of ground station (deg)
   hS             (1,1)  Ground station height (km)
   r              (1,1)  Spacecraft vector (km)
   tau            (1,1)  Polarization tilt angle (deg)

   -------
   Outputs
   -------
   aRain          (1,1)  Link attenuation

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	 Reference: Maral, G. and M. Bousquet. (1998.) Satellite Communications
               Systems, Third Edition. John Wiley. pp. 47-57.
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