Evolution of the distances of GCs from the center of the UDG. The black points show combined data from 10 random realizations of a UDG orbited by 10 GCs. The masses of the GCs in each simulation mimic the measured masses of the GCs of the DF2 galaxy (see the first column of Table 2). The horizontal black dashed line indicates the maximum resolution of the simulation. The red lines indicate the median galactocentric distance of the GCs at the given time. This was derived separately for the high-mass half of the GCs (full red line) and for the low-mass half of the GCs (dashed red line).