Top panel: gas surface density distribution (in log g cm−2) in the vicinity of the clump at t = 144.1 kyr in model 1. The superimposed black arrows show the velocity field of the gas. Bottom panel: grown dust surface density distribution (in log g cm−2) in the vicinity of the clump. The inset shows the azimuthal variations of the dust-to-gas ratio (with respect to the clump center) vs. radial distance from the clump center. The dashed white line shows the canonical value of 1:100 for the dust-to-gas ratio. In both panels the solid yellow circles mark the outer edge of the Hill sphere of the clump. The dashed yellow circles have a half radius of the Hill sphere.
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