The actual target selection colour–magnitude schemes: (a) and (c) for GIRAFFE, and (b) and (d) for UVES. Target selection based on Case 1 are shown in (a) and (b), and on Case 2 in (c) and (d), respectively. Blue solid line shows the area of targets assigned to the blue box; red dashed line – to the red box; and black dash–dotted line shows the area of second priority targets assigned to the extra box. The right-edge limit (a) Δ_G and (b) Δ_U in Case 1 of the extra box varies from field to field. The blue box in (c) and (d) for Case 2 is divided into four equal-sized magnitude bins (in order to have the same number of targets per magnitude bin). On the x-axis we show the dereddened (J−K_s)₀ colour, whereas on the y-axis we show the observed J magnitude (for more details see Section 3.2.3).