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Fig. 1

image

Geometry of the system: Sun, tangent-point (T), Galactic Center (GC) assumed by the tangent-point method. The Sun is at radius R0, T at radius R. The circular velocities are v0 at R0, and v at R, l being the Galactic longitude. We choose here a view similar as in Renaud et al. (2013) where the Northern and Southern Galactic Poles are respectively in front of and behind the reader.

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