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   Computes the chordwidth when the nadir vector is different for the leading
   and trailing edges. 
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   Form:
   w = HCw2R( ua, g, e1, e2, ue1, ue2 )
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   ------
   Inputs
   ------
   ua                     Spacecraft unit vector
   g                      Cant angle
   e1          (n)        Earth angular radius (LE)
   e2          (n)        Earth angular radius (TE)
   ue1         (3,n)      Nadir vector (LE)
   ue2         (3,n)      Nadir vector (TE)

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   Outputs
   -------
   w                      Chordwidth

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