Fig. 8.
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Evolution of the N-body simulation that produces a shell similar to what is observed in NGC 7531. From left to right, the panels show the simulated dwarf 50 Myr before the first pericenter (t = −1.28 Gyr), 70 Myr after the first pericenter (t = −1.15 Gyr), 50 Myr before the second pericenter (t = −0.11 Gyr), and 60 Myr after the second pericenter (present day).
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