V,V − I colour–magnitude diagram (CMD) of Terzan 8 from Montegriffo et al. (1998; open symbols). Filled circles indicate the stars in our sample observed with FLAMES/UVES (in blue) and with FLAMES/GIRAFFE (in red) and used for the abundance analysis (with V < 17). Filled cyan symbols are HB stars, for which we could not measure the RV. The HB star 1350, at V − I = 0.5, is a known RR Lyrae (V2, of type RRc, according to Salinas et al. 2005). Green crosses indicate members on the basis of their RV; grey plus signs are for non members.