Fig. 4
First row: normalised vorticity (Eq. (7) in the disc midplane averaged over the last 100 orbits in the VSI disc. The increased vorticity close to the planet is clearly visible. Second and third rows: normalised vorticity in the midplane for the VSI disc after 198 orbits. Last row: normalised vorticity in the midplane for the viscous α-disc after 198 orbits.
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