Colour–magnitude diagram based on UKIDSS J- and our I-band (including an offset of 31 mag) photometry. Markers are as follows, Red dots: the older field population, blue circles: young members from Peña Ramírez et al. (2012), green circles: candidate members from Peña Ramírez et al. (2012), crosses: sources initially identified as potential new members but with discrepant J−K values, crosses with circles: sources initially identified as potential new members but flagged as galaxies. The area between the two solid grey lines defines the photometric space of potential members. The dotted grey line is the approximate completeness limit.