\begin{table} %T2
%\centering
\par
\caption{Journal of MuSiCoS spectropolarimetric observations of $\alpha^2$~CVn at the TBL. The heliocentric Julian Date is given at mid--exposure. The following two columns list the pulsation and Blazhko phases. The last column
lists the derived longitudinal magnetic field values and their
corresponding uncertainties.}\label{t2}
$$
\begin{tabular}{lcr@{$\;\pm\;$}l}
\hline\hline
&&\multicolumn{2}{c}{}\\[-10pt]
HJD & rotational & \multicolumn{2}{c}{$B_\ell \pm \sigma_{\rm B}$} \\
$2~450~000+$ & phase & \multicolumn{2}{c}{(G)} \\ 
&&\multicolumn{2}{c}{}\\[-10pt]
\hline
&&\multicolumn{2}{c}{}\\[-10pt]
1732.3526 & 0.628 & 215&57  \\
1734.3830 & 0.999 & --701 & 48  \\
2101.4028 & 0.104 & --633 & 61 \\
2102.3678 & 0.280 & 107 & 61 \\
2103.3713 & 0.464 & 714 & 61 \\
2462.3665 & 0.101 & --588 & 30  \\
2463.3664 & 0.284 & 76 & 33  \\
2488.3538 & 0.852 & --617 & 31  \\
2491.3821 & 0.406 & 502 & 25  \\
\hline
\end{tabular}$$
\end{table}