HCw:

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   Computes the chordwidth. 
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   Form:
   w = HCw( ua, e, g, ue )
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   ------
   Inputs
   ------
   ua                     Spacecraft unit vector
   e                      Earth angular radius
   g                      Cant angle
   ue                     Nadir vector

   -------
   Outputs
   -------
   w                      Chordwidth

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Children:

Common: Graphics/NewFig