 $$f_0\sim 0+{\kappa-{\rm i}p_0\over p_0+p_0^*}\,z_0z_0^*,\qquad g_0\sim 0-{\kappa+{\rm i}p_0^*\over p_0+p_0^*}{p_0\over p_0^*}\,z_0z_0^*, \eqno(0.00)$$ $$u_0 \sim u_0(\theta_0+\Delta \theta_0^{(-)}), \quad  \Delta\theta_0^{(-)}=