\begin{table}%t2
\caption{\label{cal}Calibration summary.}
\small%\centerline
{
\begin{tabular}{llrlll}
\hline \hline\noalign{\smallskip}
Object		& $\it{P}_{\rm obs}$$^{a}$ & PA$_{\rm obs}$$^{a}$ & $\it{P}_{\rm lit}$$^{b}$ & PA$_{\rm lit}$$^{b}$ & PA$_{\rm corr}$\\
          &     (\%)      &   (\degr)      &    (\%)       &   (\degr)      & (\degr)    \\ 
\hline
HD 147084 &		4.5 (0.2) & 0.2          & 4.50 (0.01)   &   33.2         & $+$33.0  \\
HD 187929	&		1.5 (0.2) & 37.9         & 1.62 (0.05)   &   91.0         & $+$53.1  \\
HD 10476	&		0.2 (0.2) & --           & 0.02 (0.01)   &      --        &   --     \\
\hline
\end{tabular}}
\smallskip
Errors in parenthesis.
$^a$ Mean values for a spectrum binned with a polarization error (per bin) of 0.2\%, except HD~10476 (unbinned). The quoted polarization error is the average error per bin.
$^b$ References: HD~147084, Tapia~(\cite{tap88}), $\it{R}$ filter; HD~187929, Bailey \& Hough~(\cite{bai82}), $\it{R}$ filter; HD 10476, Bastien et~al. (1988), $\it{V}$ filter. 
\end{table}