\begin{table}%t5
\caption{Results of correlation tests between spectropolarimetric indices,
$p_0$ and three indices derived from optical spectra. $P_{\tau}$ and $P_{r_{\rm s}}$ give the 
probabilities that the correlation between the two indices are due to chance.  
$n$ is the number of points considered for the correlation. A correlation is 
emphasized if $P \leq 0.05$.  The last column gives the sign of 
the correlation.}\label{table:spec_res}
%\centering
\par
\begin{tabular}{llrrrc}
\hline \hline
Index 1 & Index 2 & $P_{\tau}$ & $P_{r_{\rm s}}$ & $n$ & 
\\
\hline
$p_0$ & $p_{\rm e}/p_{\rm c}$ \civ & 0.067 & 0.091 & 17 & $-$\\
$p_0$ & $p_{\rm e}/p_{\rm c}$ \ciii & 0.147 & 0.167 & 19 & $-$\\
$p_0$ & SI & 0.224 & 0.254 & 15 & $+$\\
$p_0$ & $p_{\rm max}$ & {\bf 0.029} & {\bf 0.019} & 22 & $+$\\
$p_{\rm e}/p_{\rm c}$ \civ & $p_{\rm e}/p_{\rm c}$ \ciii & {\bf 0.012} & {\bf 0.018} & 17 & $+$\\
$p_{\rm e}/p_{\rm c}$ \civ & SI & 0.440 & 0.647 & 13 & $-$\\
$p_{\rm e}/p_{\rm c}$ \civ & $p_{\rm max}$ & 0.966 & 0.936 & 17 & $+$\\
$p_{\rm e}/p_{\rm c}$ \civ & BI & 0.523 & 0.583 & 17 & $-$\\
$p_{\rm e}/p_{\rm c}$ \civ & DI & 0.579 & 0.640 & 17 & $+$\\
$p_{\rm e}/p_{\rm c}$ \civ & $\alpha_B$ & 0.797 & 0.763 & 17 & $+$\\
$p_{\rm e}/p_{\rm c}$ \ciii & SI & 0.553 & 0.714 & 15 & $-$\\
$p_{\rm e}/p_{\rm c}$ \ciii & $p_{\rm max}$ & 0.823 & 0.777 & 19 & $-$\\
$p_{\rm e}/p_{\rm c}$ \ciii & BI & 0.970 & 0.951 & 19 & $+$\\
$p_{\rm e}/p_{\rm c}$ \ciii & DI & 0.852 & 0.913 & 19 & $+$\\
$p_{\rm e}/p_{\rm c}$ \ciii & $\alpha_B$ & 0.823 & 0.775 & 19 & $-$\\
SI & $p_{\rm max}$ & 0.959 & 0.947 & 15 & $-$\\
SI & BI & 0.919 & 0.914 & 15 & $+$\\
SI & DI & {\bf 0.033} & 0.073 & 15 & $-$\\
SI & $\alpha_B$ & 0.203 & 0.221 & 15 & $+$\\
$p_{\rm max}$ & BI & {\bf 0.008} & {\bf 0.004} & 22 & $+$\\
$p_{\rm max}$ & DI & 0.080 & 0.093 & 22 & $-$\\
$p_{\rm max}$ & $\alpha_B$ & 0.089 & 0.059 & 22 & $+$\\
\hline  
\end{tabular}
\end{table}