Left panel: galactic polar distribution of the stars for azimuthal angle between −90 and 90 degrees. Circles with black borders highlight the targets presented in this work. All stars are colour-coded according to the measured iron abundance. The position of the sun is shown with a yellow-black symbol. Spiral arms adapted from Reid et al. (2019) are shown in different colours (see legend). Right panel: cartesian representation of the height above or below the galactic plane as a function of R_GC in two opposite directions with respect to the Galactic centre-Sun line (top and bottom panels, respectively). The colour coding and the symbols are as in the left panel. The grey area delimits the region at |Z| < 300 pc.