2MASS Colour−magnitude diagram of the field around (l,b) = (0°, −10°). Stars not observed in the present programme are plotted as black dots, observed targets as black circles, stars moderately enriched in Li as small red circles, and Li-rich stars as big red circles. Two RGB isochrones from Girardi et al. (2000), with metallicities and ages as indicated in the legend, are also included. The isochrones are truncated at the tip of the RGB.