Near-infrared colour–colour diagram of our candidates, after the selection in the optical-near-infrared CMDs. The R11 candidates appear as magenta dots, the new candidates as green circles, and red crosses show kinematical candidates with suspiciously high reddening. Objects located above the dashed lines are rejected as background stars (red crosses). The BT-Settl model 600-Myr isochrone down to 0.07 M_⊙ is shown as the thick (magenta) line, and the reddening vector (R_V = 3.1) as the black arrow.