Fig. 7

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Magnetic field topology and plasma β = P∕Pmag in the xz-plane in the MU5AD run, when the sink mass is 15 M⊙. Left panels: amplitude of the Alfvén velocity (blue colours) and the segments show the magnetic fields direction in the xz-plane. The colour-coding represents the ratio between the toroidal component of the magnetic fields over the total magnetic fields. Yellow-to-white segments exhibit strong toroidal fields with Bϕ ∕B > 0.3. Right panels: maps of the plasma β = P∕Pmag with velocity vectors overplotted. The red regions are dominated by the thermal pressure, while the blue ones are dominated by the magnetic pressure.
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