Color distribution in the cluster (red) and control field (blue) for all galaxies (top panel), bright galaxies (middle panel) and faint galaxies (bottom panel). Since membership is available on an individual basis for the bright galaxies, no control field is required for the middle panel. Colors are corrected for the slope of the color−magnitude relation assuming a slope of 0.05, consistent with the JKCS 041 data and with slopes observed at z = 0.