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Fig. 3


Top: Bzn in 3D, using the same data as in the bottom of Fig. 2, with the intensity used as a geometrical height. The colourmap is scaled exactly as the intensity. Bottom: same as the top figure, with balls that have settled in the “magnetic holes” after a few integration steps. The position of these balls on the original 2D magnetograms are shown in Fig. 4.

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