Colour-magnitude diagram (left) and the on-sky distribution (right) of the sources in our JHK_s catalogue. The colour scheme represents the membership weights computed in Section 5.2 as a probability. The orange solid line in the left panel is the 1 Myr isochrone, the dotted line refers to the 50% completeness limit for chip 4, and the dashed lines mark the position of a 0.5 M_⊙, 0.08 M_⊙ and 0.03 M_⊙ source at different extinctions. The plus signs mark the A_V=[10, 20, 30, 40, 50, 60] mag. The black circles identify the 50 spectroscopically confirmed members from Ellerbroek et al. (2013). The white dots identify the sources which are located within HAWK-I chip 4, in which the cluster is centred on. The white circle on the right is a visual representation of the inner region employed for the IMF shown in the bottom of Figure 7 and discussed in Section 10.