Origin of MW GCs: each point represents a GC and is colour-coded according to its origin. GCs are sorted from the most to the least bound in energy. in situ clusters (blue) with black edges are those associated with the MW disk by other studies. We also highlight the six GCs still associated with the Sagittarius dwarf galaxy (magenta), NGC 6397 (blue), and Omega Centauri (bold green), along with its six candidate clusters identified by Pagnini et al. (2025) (light green). Massari et al. (2019) GCs whose origin remains unidentified but which have been classified as ‘low-energy’ GCs are in grey.