Measured size distribution of galaxies in the central projected R₂₀₀ for the studied clusters, before (grey) and after (black) statistical field subtraction. Blue and red points: measured sizes for galaxies split over two bins of mean effective surface brightness, also after correction. In this size-range, the data are well described by a power-law index of –3.40 ± 0.19 (in bins of equal logarithmic size).