\begin{table}%T2
\par
\caption{\label{tab:ampli}Amplification factors determined from the (D,~AB) pair.}
\small%\centering
\par
\begin{tabular}{lcccc}
\hline\hline \noalign{\smallskip}
   Lines &  Date &  $A$ & $M$ & $\mu$\\ 
\hline  
 \ion{Si}{iv}-\ion{C}{iv} & 1989 & 0.645  $\pm$ 0.015 & 0.390 $\pm$ 0.020 & 1.65  $\pm$ 0.12 \\
 \ion{Si}{iv}-\ion{C}{iv} & 1993 & 0.915  $\pm$ 0.015 & 0.460 $\pm$ 0.040 & 1.99  $\pm$ 0.21 \\ 
 \ion{Si}{iv}-\ion{C}{iv} & 2000 & 0.775  $\pm$ 0.010 & 0.400 $\pm$ 0.020 & 1.94  $\pm$ 0.12 \\
 \ion{Si}{iv}-\ion{C}{iv} & 2005 & 0.775  $\pm$ 0.010 & 0.400 $\pm$ 0.040 & 1.94  $\pm$ 0.22 \\
 Ly$\alpha$-\ion{N}{v}    & 1994 & 1.050  $\pm$ 0.025 & 0.460 $\pm$ 0.030 & 2.28  $\pm$ 0.20 \\
 Ly$\alpha$-\ion{N}{v}    & 2000 & 0.805  $\pm$ 0.015 & 0.430 $\pm$ 0.030 & 1.87  $\pm$ 0.17 \\
 H$\beta$-[\ion{O}{iii}]  & 2005 & 0.630  $\pm$ 0.010 & 0.425 $\pm$ 0.015 & 1.48  $\pm$ 0.08 \\
 H$\alpha$                & 2005 & 0.540  $\pm$ 0.015 & 0.395 $\pm$ 0.015 & 1.37  $\pm$ 0.09 \\
 \hline 
\end{tabular}
\end{table}