Fig. 1.

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Cross-section of the total magnetic field strength of our simulation after 10 h of solar time through the centre of the spot (same cut as in Fig. 2). The sunspot magnetic field funnels out with its height embedded in the (granular) background magnetic field filling the box. Vertical green lines mark the spot and umbral boundaries as seen in upper panel of Fig. 2. The horizontal green line marks the τ = 1 surface.
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