Left: J − H versus H CMDs for cluster members in an annulus 350–600 pixels (45.̋5–78′′, 0.9–1.5 pc assuming a distance of 4.4 kpc) from the centre. Also shown are the reddening vector for the cluster field and an un-reddened 4 Myr Siess et al. (2000) isochrone shifted to a distance of 4.8 kpc and reddened by A_Ks = 0.87 as determined in the text. The main sequence is adopted from Marigo et al. (2008). The cluster main sequence is seen extending from J − H = 0.8 mag down to H = 16 mag, where the PMS population extends from J − H = 1.3 mag down to the depth of the data of H = 20.5–21 mag at this distance. Middle: same but for stars more than 800 pixels (1.9 pc) from the cluster centre. Right: same colour–magnitude diagram for the control field covering an area 1.5 times that of the CMD to the left.