Halo effect on galaxy size and its dependence on look-back time. The figure shows the mean galaxy size at log M/M⊙ = 11 vs. redshift (left panel) or look-back time (right panel) for red-sequence early-type galaxies in the field (blue points) and in cluster (red points). The number above the blue points indicates the number of combined galaxies. The solid line and shading show the fitted relation and its 68% uncertainty (posterior highest density interval).
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