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   Computes the Breguet range.
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   Form:
   range = BreguetRangeEquation( d, velocity, altitude )
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   ------
   Inputs
   ------
   d              (1,1)  See "ConcordeProperties.m"
   velocity       (1,:)  Velocity (m/sec)

   -------
   Outputs
   -------
   range         (1,:)  Range (km)

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