\[ \begin{array}{l} \Psi_{\mbox{CI}} = c_0 | \psi_{\sigma_g} \overline{\psi_{\sigma_g}} \rangle + c_1 | \psi_{\sigma_u} \overline{\psi_{\sigma_u}} \rangle \\ + c_2 | \psi_{3\sigma} \overline{\psi_{3\sigma}} \rangle + c_3 | \psi_{\pi} \overline{\psi_{\pi}} \rangle + \ldots \end{array} \]