Fig. 1
Temporal evolution of contours of toroidal magnetic field (log [(By/B0)2] ) in cases with a poloidal magnetic field, where 
. The white rectangles in panels a), c), e), and g) indicate the region of the panels b), d), f), and h), respectively. The white lines in panels b), d), f), and h) show the poloidal magnetic field lines.
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