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  Get the data from an ObjectAgent simulation
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   Form:
   y = GetSimData( file, dataName, iD)
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   ------
   Inputs
   ------
   fileName        (:)  Name of simulation file
   dataName       (m,:) Name of simulation data
                        Enter '?' for a list of all names
   iD              (n)  Spacecraft I.D. 

   -------
   Outputs
   -------

   y             {n}(m,:) Matrix of simulation data

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