are however systematic uncertainties that will contribute to the measured scatter. To assess the effects of systematic errors, we use the 75 quiescent galaxies at $0.2<z<0.9$ that have a spectroscopic redshift. We compared the $U$-$V$ colors measured for these quiescent galaxies from the photometric redshifts to the color measured using the spectroscopic redshifts. The error in redshift is strongly correlated with the resulting error in color, where an under-estimate in $z_{\mathrm{phot}}$ of 0.1, leads to a $U$-$V$ color that is $\sim$0.2 mag redder (see Appendix C). The normalized median absolute deviation of ($U$-$V$)$_{\mathrm{spec}}$-($U$-$V$)$_{\mathrm{phot}}$ is 0.05 magnitudes. We conservatively assume that the contribution to the measured scatter due to systematic uncertainties is 0.05 mag at all redshifts, but note that this may decrease at higher redshifts as our medium-band filters sample the rest-frame $U$ and $V$ filters at $z\!>$1. The scatter in the color due to measurement error is taken to be the systematic and photometric errors added in quadrature (blue points in Figure \[scatter\]).

To measure the internal scatter in $U$-$V$ in Figure \[scatter\] (black), we subtract the scatter due to measurement error (blue) in quadrature from the observed scatter. The vertical black error bars are the uncertainties in the 