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Fig. 9.

Fig. 9. Refer to the following caption and surrounding text.

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Model R010: x1 and x2 orbits in the central 1.2 × 1.2 kpc region. The x1 periodic orbits are given with colors, while the x2 in black. The almost circular shape of the orbits is associated with the trailing spirals appearing in the gas responses in Fig. 8a,b.

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