B − z versus z − K color–color diagram for the K-selected galaxies and stars in the CANDELS GOODS-S (upper panel) and UDS (lower panel) fields. Arrows indicate 1σ lower limits on the measured (B − z) color for sources that are undetected (S/N< 1) in the B band. Objects shown in blue are color-selected BzK galaxies classified as “star-forming” from the SED analysis. Those plotted in red are color-selected BzK galaxies classified as passively evolving with the same criterion. The red dashed line is a fixed reference to show the position of stars in the BzK plane, useful for showing the consistency of photometric calibration.