Fig. 12.

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Rotation curves for the nine regions highlighted in Fig. 9, derived as explained in the text. The left panel refers to the regions at positive longitude, the middle one is centered at longitude zero, while the right one refers to the regions at negative longitude. The horizontal gray line is at VY = 0 just to guide the eye, while the vertical dashed line marks the distance to the GC. As expected, most rotation curves cross the VY = 0 line at the GC position, confirming that the adopted extinction law is fairly appropriate for this region of the Galaxy.
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