“capacitor” affecting dynamics of the re-entry. In order to check whether this might be the case, we edited the original raw DT-MRI model by removing in the MRI the foreign piece, and repeated the whole heart isotropic and anisotropic simulations from the same two orthogonal initial locations of the re-entry, similar to the shown in Fig. \[3D\_iso\], Fig. \[3D\_aniso\], Fig. \[3D\_X\_iso\], and Fig. \[3D\_X\_aniso\].]{}]{}

In the 3D whole heart “edited” MRI model simulations shown in the Fig. \[3D\_shaven\_iso\]

![image](Fig7small.pdf)

and Fig. \[3D\_shaven\_aniso\],

![image](Fig8small.pdf)

a counter-clockwise excitation vortex was initiated by the phase distribution method [@chaos], with the initial position of the transmural vortex filament (yellow line) at the prescribed location [*along the $x$ axis*]{} at $y_0=40, z_0=60$. [It can be seen in Fig. \[3D\_shaven\_iso\] isotropic, and in Fig. \[3D\_shaven\_aniso\] anisotropic 3D simulations, that, at $t=0$, there was identical initial location of the filament of the excitation vortex: that is transmurally, roughly in the middle through the ventricles of the foetal heart, similar to the initial location of the vortex filament in the raw DT-MRI simulations shown in Fig. \[3D\_iso\] and Fig. \[3D\_aniso\] . ]{}

Fig. \[3D\_shaven\_iso\] shows the *isotropic dynamics* of the excitation vortex, that is with the fiber orientation 