This article has an erratum: [https://doi.org/10.1051/0004-6361/201014703e]
The comparison between different estimates of the effective surface brightness of all galaxies with HST photometry and a measured velocity dispersion. We plot the difference Δ ⟨ SBe(aebe) ⟩ between the average surface brightness within (aebe)1/2 and Re (top), the difference Δ ⟨ SBe(Ser) ⟩ between the average surface brightness within Re(Ser) and Re (middle), and the difference between the average surface brightness within Re(VLT) and Re (bottom) as a function of 1 − be/ae. Symbols and color coding are as in Fig. 4.
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