RaDec2U:

Path: Common/Transform

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   Converts right ascension and declination to unit vectors.
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   Form:
   u = RaDec2U( rA, dec )
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   ------
   Inputs
   ------
   rA    (1,n)	Right ascension (rad)
   dec   (1,n)	Declination (rad)

   -------
   Outputs
   -------
   u     (3,n)	Unit vectors

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