generated from the 2008A and 2008B semesters only. The AEGIS catalog contains 15 filters and the COSMOS catalog contains 21 filters ($u$-8$\mu$m). The optical and near-IR images were convolved to the same point-spread function (PSF) before performing aperture photometry, so as to limit any bandpass-dependent effects. The photometry was done with SExtractor [@Bertin96] in relatively small color apertures chosen to optimize the signal-to-noise. We determine an additional aperture correction from the $K$-band image that accounts for flux that falls outside of the AUTO aperture, thereby enabling us to calculate total magnitudes [see, e.g. @Labbe03]. We use an alternative source fitting algorithm especially suited for heavily confused images for which a higher resolution prior (in this case, the $K$-band image) is available to extract the photometry from the IRAC images[^2]. This method is described in more detail in the appendix of @Marchesini09.

Using the EAZY photometric redshift and rest-frame color code [@Brammer08], we find the photometric redshifts in COSMOS to be in excellent agreement with the spectroscopic redshifts made publically available through the $z$COSMOS survey [@Lilly07], with $\sigma_{z}$/(1+$z$)=0.016 for 632 objects at $z_\mathrm{spec}\!<$1. We also find excellent agreement between the photometric and spectroscopic redshifts for a larger sample of 2313 objects 