Left panel: Kiel diagram showing a BASTI isochrone corresponding to [M/H] = −2.5 and an age of 10 Gyr in black. Stars from the high confidence sample with to which distances have been determined are shown colour-coded by their offset from the distance determined by parallax. Right panel: Plot of the difference between our distances and the parallax distances plotted against parallax distance for the same stars as the left panel.