\begin{table}%T3
\par
%\centering
\par
\caption{Magnetic field strengths for an electron-positron jet.
Regions~I, II, and III are chosen as in Table~\ref{tab2}.}
\label{tab3}
\begin{tabular}{c|ccc} \hline\hline
Region & $B_{\rm total}$ &$B_{\rm uniform}$ &$B_{\rm random}$ \\
   &  [$\mu$G] & [$\mu$G] & [$\mu$G] \\  \hline 
I    &  92 $\pm$ 5 & 60 $\pm$ 6 & 70 $\pm$ 7 \\
II   &  88 $\pm$ 4 & 70 $\pm$ 7 & 53 $\pm$ 5 \\
III  &  85 $\pm$ 4 & 75 $\pm$ 8 & 37 $\pm$ 4 \\ \hline
\end{tabular}
\end{table}