(Y − J, Y) and (J − K, J) colour − magnitude diagrams for a ~4.3 square degree surveyed in IC 4665 by the GCS. Overplotted are the 30 Myr NextGen (solid line; Baraffe et al. 1998) and DUSTY (dashed line; Chabrier et al. 2000) isochrones shifted to a distance of 350 pc. Masses are given on the right-hand side of each plot for the 30 Myr isochrones. Filled circles represent the optically selected candidates from de Wit et al. (2006) whose membership is confirmed by their infrared photometry. Crosses are optically selected candidates rejected as cluster members on the basis of their infrared colours. Overplotted are the lines for photometric selection as described in Sect. 4.2.
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