\begin{table}%t5
\caption {\label{tab:fields_old}Longitudinal magnetic fields of four previously studied Herbig Ae stars with detections at the 3$\sigma$
significance level.
}
%\centering
$$
\begin{tabular}{rr @{$~\pm~$} l}
\hline
\hline
\multicolumn{1}{c}{Object} &
\multicolumn{2}{c}{$\left< B_z\right>_{\rm all}$} \\
\multicolumn{1}{c}{name} &
\multicolumn{2}{c}{[G]} \\
\hline
HD~139614 & $-$93  & 14 \\
HD~144432 & $-$111 & 16 \\
V380~Ori  & 460    & 70 \\
BF~Ori    & $-$144 & 21 \\
\hline
\end{tabular}$$
\end{table}