Colour–magnitude diagrams with 2MASS PSC photometry. (a) CMD of the field GES_MW_142000-050000 centred at Galactic longitude l = 339| $_{.}^{\circ}$|9 and latitude b = 51| $_{.}^{\circ}$|4, and FoV = 35 arcmin in diameter. (b) UVES target selection based on Case 1. Blue circles – selection of targets in the blue box, and grey stars – extra targets, respectively.