EccGeometry_Structure:

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   Initialize an eccentric geometry data structure.

   Since version 7.
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   Form:
   g = EccGeometry_Structure( nU );
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   ------
   Inputs
   ------
   n            (1)    Number of geometry structures

   -------
   Outputs
   -------
   g            (.)    Geometry data structure with fields:
                          - y0
                          - xMax
                          - nu_xMax
                          - zMax
                          - nu_zMax

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