Triple ionization of ﹩{{\rm{S}}}^{0+}﹩ forming ﹩{{\rm{S}}}^{3+}﹩ (filled circles) and quadruple ionization of ﹩{{\rm{S}}}^{0+}﹩ forming ﹩{{\rm{S}}}^{4+}﹩ (filled squares), from the measurements of Ziegler et al. (1982a). The solid curves show our fits to the data using the semiempirical formulae, as discussed in Section 3.15.