GCLF as a function of absolute magnitude M_F814W (bottom) and apparent magnitude (m_F814W)₀ (top) of the detected GCs within 2R_e (blue), and the detections outside 2R_e (grey) for the UDG MATLAS-2019, which has the largest number of GCs in our sample. The black points are for the raw count within 2R_e and the red points show the GC count after background subtraction. The red solid line shows the Gaussian fit with peak absolute magnitude M_V = −7.3 mag and a dispersion of 1 mag.