Fig. 3.
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Potential magnetic field lines and isosurfaces that include X-points. A visible critical point is located around x = 0.5 and y = 0.5, but due to rotational symmetry, it is repeated along a circular path, and in reality, it is a null line. The same parameters as in Fig. 2 were used except that C1 and C2 have the same sign in this case.
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