Single-ionization cross sections for the ground level of Si⁺. The solid (black) line represents the total CI LLDW cross sections that include excitations from the 3p³ configuration in the intermediate wavefunction of the ground configuration (see text for explanation), the dashed (green) line represents cross sections without excitations from the 3p³ configuration, the dashed-dotted (magenta) line represents single-configuration cross sections when DI values are obtained in the potential of the ionizing ion, the dashed-dotted-dotted (red) line represents single-configuration cross sections when DI values are obtained in the potential of ionized ion, and the dotted (blue) line represents the total CADW cross sections (Djurić et al. 1993). Experiment is shown by open circles with error bars (Djurić et al. 1993).