Scaled double-ionization cross sections for several Be-like ions: ﹩{{\rm{C}}}^{2+}﹩, ﹩{{\rm{N}}}^{3+}﹩, and ﹩{{\rm{O}}}^{4+}﹩. The symbols show the measurements of Westermann et al. (1999), and the solid curves are the cross sections reported here, which in this case use the semiempirical scheme of Shevelko et al. (2005).