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   Converts semi-major axis and eccentricity to right perigee and apogee.
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   Form:
   [rP, rA] = AE2RPRA( a, e )
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   ------
   Inputs
   ------
   a               (1,1) Semi-major axis
   e               (1,1) Eccentricity

   -------
   Outputs
   -------
   rP              (1,1) Perigee
   rA              (1,1) Apogee

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