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Fig. 1

image

Gas surface density maps in model 1 shown for the inner 1200 × 1200 au2 box at nine evolutionary times. The time is counted from the formation of the central star. The disk forms at t = 12.4 kyr. The insets in the upper-right corner of each panel present the dust-to-gas mass ratios for all azimuthal grid points at a specific radial distance from the star. The red arrows indicate the position of an inward-migrating clump. The scale bar is in log g cm−2.

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