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Fig. B.1.

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The dependence of de-acceleration on the outer shell Ro collapse speed (vo, col, the negative value indicates continuous expansion, the positive collapse of radius). While keeping the inner radius collapse speed (vcol = 10 km s−1) as constant. We can see that the de-acceleration remains relatively constant throughout various speeds, indicating that the outer shell collapse speed alters the overall transfer of gas angular momentum only little.

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