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Fig. 2.

image

Example of a ring and gap structure and its surrounding outflow topology in the 3D shearing box simulation of Riols & Lesur (2018) with ambipolar diffusion. Top panel: gas density (colourmap in log scale) and streamlines (cyan lines) in the poloidal plane (x and z are respectively the radial and vertical coordinates). Bottom panel: vertical magnetic field (colourmap) and poloidal magnetic field lines (in white) showing the inclined “plume” structure from where most of the mass is extracted. The thickness of the lines is proportional to the field intensity.

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