\[\mathbf{E}_{\nu}\left(z\right)=\frac{2}{\pi\nu}\left({\sin}^{2}\left(\tfrac{1}%
{2}\pi\nu\right)+\frac{\nu z}{\nu^{2}-1}{\cos}^{2}\left(\tfrac{1}{2}\pi\nu%
\right)+O\left(\frac{1}{\nu^{2}}\right)\right).\]