Fig. 1.

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Appearance of the inner disk in a zoomed snapshot in our magnetic simulation after T = 80 stellar rotations. The matter, is lifted from the disk into the accretion column, feeding it onto the stellar surface. The matter density is shown in logarithmic color grading in code units, with a sample of velocity vectors shown in two normalizations: since the velocity in the corona is much larger than in the disk, velocity vectors are shown with a different scaling in the disk and the corona, the units of the respective velocity vectors being shown in the legend at the bottom left of the figures. With the white solid lines is shown a sample of the poloidal magnetic field lines. The green solid line marks the position of the corotation radius.
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