3D views of the instability in the two cases: Case C2 on top and case R2 below. The magnetic field lines of the background axisymmetric magnetic field are plotted around the location of the instability and colored with the values of the toroidal magnetic field (in the Y-direction in the Cartesian frame shown at the bottom left) and isosurfaces of the axial component of the fluctuating magnetic field are overplotted.