Top panel: normalised metallicity distribution of the LP First stars sample (grey histogram), compared to the ultra-metal-poor sample studied by Sestito et al. (2019) (yellow histogram), the Nissen & Schuster (2010) sample (orange histogram) and the Gaia DR2-APOGEE sample (pink histogram). The four samples span about 7 dex in [Fe/H]. Middle panel: distribution in the XY plane of stars from the Gaia DR2-APOGEE (stellar number density map in logarithmic scale), the LP First stars (black dots), the Nissen & Schuster (2010) sample (orange dots), and the Sestito et al. (2019) sample (yellow dots). Units are in kpc. Bottom panel: distribution in the RZ plane of stars in the different samples. Colours and units are the same as those adopted in the middle panel.
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