\[f\left(\epsilon,\ell;r\right)=(-1)^{\ell+1}\left(\frac{2}{\pi\tau}\frac{e^{2%
\pi/\tau}-1}{A(\epsilon,\ell)}\right)^{\ifrac{1}{2}}F_{\ell}\left(1/\tau,-\tau
r%
\right),\]