\begin{displaymath}
V_j\left(r\right)=-\frac{16\pi}{25}\frac{1}{r f\left(r\right)}\left[1
-\frac{462 \ln f\left(r\right)}{625 f\left(r\right)}+\frac{2 {\gamma}_E
+53/75}{f\left(r\right)}\right]+d r e^{-g r }+ a r 
\end{displaymath}
