Upper panel: comparison of ACS and VEGAS-SSS aperture-corrected magnitudes for the GCs and UCDs. Dots and shaded histogram refer to GCs, UCDs are shown with empty circles (with symbol size scaled to R_h) and thick solid line histogram. The number of matched sources is reported together with the median and rms of the VEGAS-SSS to ACS m_g difference. Lower panel: as upper, but the SExtractor AUTO magnitude is used for both GCs and UCDs.