NOrbVector:

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   Compute a vector of maneuver durations from time window data

   Since version 7.
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   Form:
   nOrb = NOrbVector( window );
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   Inputs
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   window           (.)  Time window data structure with following fields
                          - nOrbMin
                          - nOrbMax
                          - nManeuvers

   -------
   Outputs
   -------
   nOrb

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