Velocity maps of OB stars. Left panels: inferred radial, azimuthal, and vertical velocity from top to bottom. The velocity ranges have been chosen to enhance contrasts. Right panels: maps of the radial velocity (top panel), the azimuthal residual velocity (middle panel), and the vertical velocity (bottom panel), compared to the overdensity contours of the OB stars (grey shaded areas), calculated as explained in Sect. 3.1. In all panels, the position of the Sun is marked by a filled circle. The maps were obtained considering only stars within |z|≤0.3 kpc. The velocity and maps (left-hand column) can be found at the CDS in FITS format.