Stacked histogram of the fraction of observed photometric cluster members as a function of V. In blue we show the contribution from the RAVE survey (first two bins), in orange from Gaia DR2 (V = 10–13), and in green from the Gaia-ESO survey (V = 12–16). The components in black and light grey represent our own observations with only AAOmega and Hydra-S, respectively (V = 12–19). In dark grey we show the contribution of stars observed with both instruments (V = 12–16). The number in each above each bar indicate the total number of observed stars.