\begin{table}%t9
\caption{Statistical analysis of the correlations between the residuals of the
index--$\sigma$ relation and the H$\beta$ index. For a significance level lower
than $\alpha=0.05$, a value of $t$ higher than~1.96 confirms the existence of
correlation.\label{tab-corr-hbeta}}
%\centering
\par
\small
\begin{tabular}{@{}l r r@{}}
\hline\hline
               & \multicolumn{1}{c}{LDEG} & \multicolumn{1}{c@{}}{HDEG}\\ 
 Index         & \multicolumn{1}{c}{$t$}  & \multicolumn{1}{c@{}}{$t$} \\ 
\hline 
 D4000         &$ 1.00$  &$ -1.06$ \\ 
 H$\delta_A$   &$ 0.08$  &$-0.50$  \\ 
 H$\delta_F$   &$ 2.50$  &$  0.73$ \\ 
 CN$_2$        &$-0.85$  &$ 0.42$  \\ 
 Ca4227        &$ 0.34$  &$  0.36$ \\ 
 G4300         &$ 2.21$  &$ 1.04$  \\ 
 H$\gamma_A$   &$-0.29$  &$ -0.34$ \\ 
 H$\gamma_F$   &$ 2.07$  &$ -0.04$ \\
 Fe4383        &$ 3.00$  &$  0.82$ \\ 
 Fe4531        &$ 2.61$  &$ 0.90$  \\
 Ca4455        &$ 2.93$  &$  0.56$ \\ 
 C4668         &$ 1.47$  &$ 0.16$  \\
 Fe5015        &$ 1.32$  &$  2.23$ \\ 
 Mgb           &$-4.24$  &$ 0.36$  \\
 Fe5270        &$ 1.97$  &$  1.50$ \\ 
 Fe5335        &$ 2.20$  &$ 1.85$  \\
\hline  
\end{tabular} 
\end{table}