Left: histograms of the absolute magnitudes of all detected GCs in the MATLAS fields (filled gray), the GCs that are Gaia matches (hashed red) and the GCs that are nuclei matches (hashed violet). The Gaia matches were removed from the GC sample but the nuclei matches were kept since some may be real GCs seen in projection at the center of the galaxy. The GC detection limiting absolute magnitudes for each galaxy are displayed as the black solid line histogram. The dashed gray vertical line shows the absolute magnitude of the most luminous Milky Way globular cluster, Omega Centauri (M_V = −10.4). Right: histogram of the GC counts N_GCobs, Gaia matches removed and background corrected, for the MATLAS non-UDGs (filled gray) and UDGs (hashed green).