Metallicity dependence of ﹩( \mathrm{FUV}\,-V) _{0}﹩ colors for M87 GCs (circles), Milky Way GCs (triangles), two Milky Way open clusters (inverted triangles), and galaxies (squares). Objects with bluer colors lie higher in the diagram. The Mg₂ indices for M87 clusters were estimated from their ﹩( V-I) _{0}﹩ colors (see text for details). The colors and Mg₂ indices for Milky Way GCs were adopted from Table 6, while those for galaxies are from Table 3 of DOR95, updated by Trager et al. (1998). Although some M87 clusters overlap the galaxies in the Mg₂ index, they have distinct far‐UV properties.