Surface density of the stars selected in Sect. 3 projected on the Galactic plane. The Sun is in (0,0), the x-axis is directed towards the Galactic centre, and the y-axis towards Galactic rotation. The z-axis is perpendicular to the plane. The density is displayed in arbitrary units. The dashed circles have radii from 1 to 6 kpc, in steps of 1 kpc. The labels follow the nomenclature proposed by K. Jardine (http://gruze.org/galaxymap/map_2020/). The gaps in the density distribution mentioned in Sect. 5 are indicated by grey circles.
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