Top panel: histogram (hatched black) of the distances (in kpc) to the Sun, of the sample of stars studied in the frame of the ESO LP First Stars. The grey histogram shows the distance distribution of giant stars, the red histogram that of turnoff stars; middle panel: X − Y spatial distribution of stars in the sample (grey dots for giants, red dots for turnoff stars), and their uncertainties; bottom panel: R − Z spatial distribution of stars in the sample (grey dots for giants, red dots for turnoff stars) and their uncertainties.