Distribution of the analysed stars in the Milky Way, relative to the position of the Sun at the origin of the Cartesian coordinate system. Upper panel: distribution of the stars in the Galactic plane; the Galactic centre lies in the direction ℓ = 0°. The sketched spiral arm locations are according to Xu et al. (2021), based on the spiral structure model of Reid et al. (2019), from top to bottom: the Perseus, Local, and Sagittarius spiral arms. Lower panel: elevation of the stars above or below the plane. The error bars indicate distance uncertainties from the spectroscopic distances and for IDs#2a and 5a from the inverted Gaia EDR3 parallaxes. Numbers correspond to the internal ID numbers.