Fig. 1.
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Distribution of the 500 sampled particles of five UMP planar stars in the (X, Y) and (Jϕ, Jz) space, color-coded by their planar radius (R) 6 Gyr ago. The two left columns show that most of the particles approximately maintain their orbits under a constant bar for 6 Gyr. The two right columns show a much larger scatter in both spaces for a decelerating bar.
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