Fraction of star clusters that are gravitationally bound by time t in the external tidal field of a galaxy as functions of the galactocentric radius R_g, initial cluster mass M_ecl and metallicity Z. The galactocentric radius R_g of the orbit is indicated by the line thickness (thick – 4 kpc; medium – 8 kpc; thin – 12 kpc), the cluster mass is indicated by the line colour (cyan – 100 M_⊙; magenta – 400 M_⊙; black – 1600 M_⊙), and the metallicity for the models with R_g = 8 kpc is indicated by the line style (solid – Z = 0.014; dashed – Z = 0.006; dotted – Z = 0.002).