Orbit of a star in the longitude-velocity diagram that starts at (x,y) = (0.0,3.0) with a velocity(vx,vy) = (0.0,0.0) in the gravitational field of a rotating bar plus the bulge plus a point source at the Galactic centre – see text (green). Maser stars from Sevenster’s survey and in red the high-velocity maser stars from Table 1 (black).
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