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Fig. 4.

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Reference systems used in this work, depicted in the XY plane. The Sun and the Galactic center are indicated with a yellow and black circle, respectively. The white star represents a given star in our catalogs. l is the Galactic longitude, and θ and β are defined in the text. Θ is the circular rotation velocity at the position of the Sun, and Θ*, RSR is the rotational velocity at the position of the star. LSR and RSR velocities are shown in light blue and green, respectively. The tangential velocity VTAN and the line-of-sight velocity VLOS are shown in red. The third velocity components of the LSR and the RSR systems, WLSR and WRSR, are not shown in the figure because they are perpendicular to this plane.

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