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Fig. 6

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Velocity gradient versus the length over which the gradient has been fitted. Red and orange plus signs represent the velocity gradients fitted in Zhou et al. (2022) and Zhou et al. (2023), respectively. The dashed lines show free-fall velocity gradients for comparison. For the free-fall model, from left to right, the lines denote masses of 100 M, 1000 M, 3000 M, 10 000 M, and 30 000 M.

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