Notes. Settings of the UFD models and its binaries, illustrating the general properties and the binaries properties. N is the number of stars, Q is the virial ratio of the cluster, r_vir is the virial radius, the Plummer model is the density profile distribution, t_rel, c and t_rel, hm are the relaxation time at the core radius (the radius where the density of the cluster is half of the central density) and the half-mass radius region (the numerical equivalent of the half-light radius, counting the number of stars instead of the luminosity). t_df, c and t_df, hm are the dynamical friction timescales, which we assumed to be one-third of the relaxation time (see text). Z is the absolute metallicity of the UFD. For the binaries, we define f_b as the fraction of the total number of stars that are in binary systems, so 50%, for N = 82 000 stars, means that 41 000 stars are in a 20 500 binary systems. (1) Weidner et al. (2009); (2) Wang et al. (2015).