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Fig. 7
Orbits of equal mass test particles flow inward to a black hole along geodesic trajectories, which form a smooth and curved surface. The black hole spin is a = 0.96, the initial tiled angle of the disk is β = 30°. The initial physical velocities of the particles under the tetrad are: 
, 
, 
. The radius of the ring is 20 rg.
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