Effect of different extinction laws on JK_s[3.6][4.5] and HK_s[3.6] color–color diagrams. Top panels: two SEDs of quiescent galaxies (magenta and cyan lines), that is, a population 1 Gyr old redshifted to z = 3 and a population 0.5 Gyr old redshifted to z = 4 (i.e., z_form ≈ 6) built with BC03 models. Bottom: evolution in the color–color plots for star-forming and passive galaxies. Tracks representing star-forming galaxies are shown in solid blue, solid black and dashed cyan lines, for the Calzetti, Seaton and Fitzpatrick laws, respectively, and their characteristics are shown in the inserted legends. Tracks for quiescent galaxies (with e-folding time of τ = 0.1 Gyr and solar metallicity) are shown in solid magenta, solid orange, dashed red and brown for the Calzetti (A_V = 0 and A_V = 1), Seaton and Fitzpatrick laws, respectively.