Fig. 1
Simulation box and grid refinement. The square simulation box is ± 25 × 103 km large and has an increasing resolution dx when coming closer to the nucleus. dx = 1600 km for x< 25 000 km, dx = 800 km for x< 12 800 km, dx = 400 km for x< 6400 km, dx = 200 km for x< 3200 km and dx = 100 km for x< 800 km. These limits apply to the centre of the cells.
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