Fig. 1

Vertical magnetic field strength Bz of three different initial magnetic field configurations (top from left to right) for simulation runs having an initial magnetic field fragmented into kG flux tubes before the diffusion process sets in. Horizontal cuts at z = 0 (top row), 2.85 Mm (middle), and 10 Mm (bottom row). Vertical box depth of the simulation is 10 Mm.
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