Fig. 11
Top: average color of the samples in redshift bins. The low-z (blue crosses), the SDSS-II (green squares) and the SNLS (orange circles) samples are binned separately. The plot provides a visual assessment of the selection bias affecting each survey. Bottom: residuals from the ΛCDM fit of the JLA Hubble diagram as a function of redshift. The different surveys are shown separately.
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