Color‐redshift diagrams for two PEGASE models at three formation redshifts. The upper lines represent a solar metallicity instantaneous burst model with no obscuration, while the lower lines show a zero initial metallicity exponentially declining star formation with ﹩\tau =0.5﹩ Gyr and "spheroid" extinction assumed. The diagonal lines represent 5 σ limits in SDSS g, r, and i bands. Objects above the diagonal line will not be detected in the individual SDSS band.