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Fig. 1

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Global evolution of the magnetic field lines, the QSL, and the electric current during the flux rope ejection. Top row: sets of random field lines at t = 15,30, and 45  tA. Their colors are chosen randomly. Middle row: 2D vertical cuts for the decimal logarithm of the squashing degree Q for y = −0.3. High values of Q are red-colored. White corresponds to magnetic field lines reaching the sides of the numerical box. Bottom row: corresponding vertical cuts of the current density J(x, − 0.3, z).

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