Two-color-diagram to characterize the microlensing candidates. The colors J − H against H − K are shown. In the upper panel 10 000 Hipparcos stars (red dots) and about 200 dwarfs (black triangles) from the “All-Sky Catalog of Bright M Dwarfs” (Lépine & Gaidos 2011) are plotted. The lower panel presents the supposed microlensing candidates (blue triangles) and the same Hipparcos stars as in the upper panel.