Comparison of r-band magnitudes measured over 5″ × 5″ apertures within MUSE synthetic images (r_MUSE) and SDSS images (r_SDSS) for the nine galaxies with SDSS imaging available. Each panel is separated into a main one-to-one comparison plot and an additional plot below showing the magnitude difference (Δr_{MUSE − SDSS}) versus the SDSS value. Insets in each panel show the histograms of the magnitude difference, with the median offset indicated with a dashed line. Solid lines indicate the identity line (or the 0 value for the magnitude difference). Across this sample of galaxies, the median offset ranges from −0.06 to 0.01 mag. Typical scatter within any galaxy is ∼0.04 mag.