Hills2LVLH:

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   Converts a state vector from the Hills to the LVLH coordinate frame.

   Since version 7.
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   Form:
   xL = Hills2LVLH( xH )
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   Inputs
   ------
   xH               (6,:) [r;v] Hills frame

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   Outputs
   -------
   xL               (6,:) [r; v] LVLH frame

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