ProjCircSimStruct:

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   Set up the data structure for a DFF simulation involving a 
   reconfiguration to a projected circular formation. 
   All inputs are optional.

   Since version 7.
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   Form:
   sim = ProjCircSimStruct( el, nOrbits, nSC, jD, ideal );
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   ------
   Inputs
   ------
   el         (n,:)    Initial element set for all spacecraft.
   nOrbits     (1)     Number of orbits simulation will last.
   nSC         (1)     Number of spacecraft to simulate.
   jD          (1)     Julian date at start of simulation.
   ideal       (1)     Flag indicating whether to use ideal actuation.

   -------
   Outputs
   -------
   sim          (.)    Simulation data structure to be input to DFFSimulation

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Children:

Common: Time/JD2000
FormationFlying: Coord/InitializeFormation
FormationFlying: DataStructures/Geometry_Structure
Orbit: GravityModels/LoadGravityModel
Orbit: OrbitCoord/Alfriend2El
Orbit: OrbitCoord/El2Alfriend
OrbitMiniToolbox: Support/El2RV
SC: BasicOrbit/OrbRate