\[E(P_{1},P_{2})=\theta\genfrac{[}{]}{0.0pt}{}{\boldsymbol{{\alpha}}}{%
\boldsymbol{{\beta}}}\left(\int_{P_{1}}^{P_{2}}\boldsymbol{{\omega}}\middle|%
\boldsymbol{{\Omega}}\right)\Bigg/\left(\sqrt{\zeta(P_{1})}\sqrt{\zeta(P_{2})}%
\right),\]