\begin{table}%t2
%\centering
\par
\caption{ Results of magnetic field measurements
of Herbig Ae/Be and Vega-like stars.}\label{tab:results} 
\begin{tabular}{rlrc}
\hline\hline\noalign{\smallskip}
\multicolumn{1}{c}{HD} &
\multicolumn{1}{c}{MJD}  &
\multicolumn{1}{c}{$\left<B_z\right>$} &
\multicolumn{1}{c}{Remarks} \\
\hline\noalign{\smallskip} \multicolumn{4}{c}{Herbig Ae/Be
stars}\\
\noalign{\smallskip}
31648 &53296.35&$+87\pm22$~G & \\
38238 &53249.37&$-115\pm67$~G & \\
139614&52904.04&$-450\pm93$~G & \\
139614&53405.37&$-116\pm34$~G & \\
144432&52900.99&$-94\pm60$~G & \\
144432&53447.35&$-119\pm38$~G & \\
144668&52901.01&$-118\pm48$~G & \\
144668&53120.25&$-107\pm40$~G & \\
163296&53279.00&$-57\pm33$~G & \\
190073&53519.38&$+84\pm30$~G & \ion{Ca}{ii} H+K \\
\hline\noalign{\smallskip}
\multicolumn{4}{c}{Vega-like stars}\\
\noalign{\smallskip}
26676 &53278.33& $+42\pm136$~G & \\
39060 &53296.26& $-79\pm53$~G & \\
61712 &53359.25& $-16\pm47$~G & \\
102647&53403.37& $-107\pm76$~G & \\
109085&53405.32& $-114\pm59$~G & \\
115892&53405.34& $-77\pm30$~G & \\
219571&53279.03& $-49\pm41$~G & \\
\hline\noalign{\smallskip}
\multicolumn{4}{c}{Normal A star}\\
\noalign{\smallskip}
104321&53385.37& $+30\pm37$~G & \\
\hline\noalign{\smallskip}
\end{tabular}
\end{table}