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1 Introduction
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2 CO observations and global properties of the emission
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3 Kinematic modeling
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4 Mass inflow
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5 Discussion
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6 Conclusion
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References
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Online Material
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Appendix A: Detailed description of the modeling
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Appendix B: Resonance radii and pattern speed in a logarithmic potential
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Appendix C: Mass inflow in a logarithmic potential with a bar perturbation
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