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   Computes the leading edge dihedral angle for a spinning spacecraft.
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   Form:
   lE = HLE( uA, uS, uE, earthRadius, cant )
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   Inputs
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   uA                     Spacecraft unit vector
   uS           (3,n)     Unit sun vectors
   uE           (3,n)     Unit nadir vectors
   earthRadius
   cant

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   Outputs
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   lE           (n)       Leading edge dihedral angle

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