Selection of sources for constructing the master catalog of GCs. Left panel: FWHM_W versus mag_W for all sources in the three ancillary MUSE fields, weighted by their CS_W values. Spectroscopically confirmed GCs from Grasser et al. (2024) are shown as red dots. Right panel: Source selection process. Shown are the initial candidates selected based on the CS parameter (cyan dots), the final sample after applying FWHM_W and magnitude cuts (orange squares), and the spectroscopically confirmed GCs (red dots).