Color–color diagram showing the position expected for spectral templates with redshifts z ~ 0–9.0: E-type galaxies (CWW; red solid line), Im-type galaxies (blue line), and starburst templates of Kinney et al. (1996) (magenta and green lines). Red crosses show the colors of M, L, and T, stars from the SpeX Prism libraries of Burgasser et al. (2006). Black lines delimit our selection window for z ≳ 7.3 galaxies. Our 9 Y-dropout candidates are marked with black squares and arrows: #1 to #8 correspond to Y1 to Y8, whereas #10 is z1.