The upper panel shows the differences between the SDSS DR7 and DR8 Petrosian galaxy magnitudes as a function of galaxy luminosity. The lower panel shows the relative difference between the SDSS DR7 and DR8 group luminosities as a function of distance for groups with four and more members, which were identified as the same in the DR7 and DR8 samples. Solid lines show the 0.1, 0.5, and 0.9 quantiles, respectively.
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