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  LoadingInfo:  {
     Bunch: {
       Type: Gaussian        //Gaussian bunch (the only option)
       Sigma: 2e-3           //Sigma (RMS) size of the bunch
       Nsigmas: 5            //beam occupies the location from -5 sigma to +5 sigma, total of 10 sigmas
       Charge: 1.            //charge
     }
     Symmetry factor: 4      //factor by which to reduce the charge to account for symmetry conditions (monopole on axis: use 4, dipole at X (or Y) offset: use 2 in connection with proper electric boundary conditions in one plane)
     StartPoint: 0. 0. 0.    //StartPoint is the position where the beam enters the structure (typically at low Z values)
     Direction: 0. 0. 1.     //Direction along which the bunch will move, at the speed of light (should be the direction of the normal of the face with BoundaryID)
     BoundaryID: 5           //The boundary ID (sidelist number from Cubit), specifies the boundary through which the bunch enters the structure (should be a flat surface, containing StartPoint)
  }