Fig 10. Ruhland et al. http://arxiv.org/abs/0901.4340
They present first measurements of the evolution of the scatter of the cosmic average early-type galaxy color-magnitude relation (CMR) from z=1 to the present day, finding that it is consistent with models in which galaxies are constantly being added to the red sequence through truncation of star formation in blue cloud galaxies.
This fig. shows comparison between observations and a model in which new red sequence galaxies are being constantly added at the rate required to match the observed number density evolution The model predicts the correct CMR scatter and its evolution.
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