\[R_{F}\left(t_{0}^{2},t_{0}^{2}+\theta c_{0}^{2},t_{0}^{2}+\theta a_{0}^{2}%
\right)=R_{F}\left(T^{2},T^{2},T^{2}+\theta M^{2}\right)=R_{C}\left(T^{2}+%
\theta M^{2},T^{2}\right).\]