Relation between M_V and the internal velocity dispersion for Milky Way and M31 GCs (grey circles). The grey line represents the fit to the relation as described in BFG24. The black points show the location of the DF2 GCs for our fit to this relation giving d = 16.2 Mpc. Yellow triangles show the location of the DF2 GCs assuming a further distance (d = 21.7 Mpc; Shen et al. 2023), while purple stars show the DF2 GCs assuming d = 13 Mpc (Trujillo et al. 2019). For the shorter and further distances, the DF2 GCs systematically appear to depart from the relation defined by the Milky Way and M31 data.