H − K_s vs. J – H color–color diagram of W3 Main. Overplotted are the theoretical 2 Myr isochrones for A_Ks = 0 and A_Ks = 3 mag (solid lines). The diagonal dotted lines represent the expected location of reddened stars without excess (filled circles). The stars selected for possessing a near-infrared excess (triangles) are selected to be to the right of this reddened main sequence with more than 3 times their color-error in both J − H and H − K_s.