Fig. A.1

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Results for our resolution study using FargoCPT. The overall shape of the gap is resolved with around 4 cps, while it takes 8 cps to properly resolve the gap depth and the contrast of most pressure bumps far from the gap. We are interested in the region between 0.5–2.0 rp. Extending the outer boundary to r = 10 rp in the “8-8-ext” model practically made no difference. It should be noted that the 16 × 16 cps model develops some small-scale vortices in the inner disk, which causes these differences around 0.7 rp. Interestingly, a model that resolves the radial and azimuthal directions with 4 and 1 cps, respectively, captures these radial features almost as well as one with 4 cps in both directions.
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