Spatial distribution of our sample stars with respect to the Galaxy centre. The colours of the symbols distinguish the Precision samples (empty circles) and the Gaia-ESO sample (filled blue circles). A sample of 6250 halo stars of the GALAH survey are plotted as reference background, colour-coded by density. The dotted lines indicate Z_⊙ ± 1.5 and R_{GC ⊙} ± 1.5 kpc. Histograms of the distribution in R_GC and Z of the full and the Precision samples I and II are displayed.