\[R=\sqrt{(\cos2\theta-A)^2+\sin^22\theta}\]
\[\sin^22\theta_m=\frac{\sin^22\theta}{R^2}\]
\[P_{e\to x}=\sin^22\theta_m\,\sin^2\!\Bigl(\pi R\,\frac{L}{L_{\rm vac}}\Bigr)\]
\(\theta_m\)—
\(\Delta_m/\Delta\)—
\(\sin^22\theta_m\)—
\(L_m/L_{\rm vac}\)—
\(P_{e\to x}\)—