\begin{table}%t2
      \caption{Metal abundances in Damped Lyman-$\alpha$ systems.}
         \label{table2}
          %\centerline
{
          \begin{tabular}{l c c c c c c c c}
          \hline\hline
Name &  $z_{\rm abs}$ & [Fe/H] & [O/H] & [N/H] & (O/H)+12$^c$ & (N/O)$^d$ & [S/H] & [Si/H] \\
\hline  
Q 0000$-$263$^a$  & 3.390  & $-$2.00(0.09) & $-$1.67(0.13) &   $-$2.50(0.08) & 7.02 &  $-$1.69(0.10)     & $-$1.89(0.09) & $-$1.88(0.08) \\
Q 0102$-$190      & 2.926  & $-$1.68(0.10) & $-$1.56(0.13) &   $-$3.07(0.15) & 7.13 &  $-$2.30(0.16) & $-$1.37(0.10) & $-$1.50(0.10) \\
Q 0112$-$306      & 2.418  & $-$2.64(0.09) & $-$2.24(0.12) &   $-$3.17(0.09) & 6.45 &  $-$1.79(0.09)     & $-$1.25(0.08) & $-$2.42(0.08) \\
Q 0347$-$383      & 3.025  & $-$1.85(0.05) & $-$0.97(0.12) &   $-$1.92(0.05) & 7.72 &  $-$1.81(0.11)     & $-$1.18(0.06) & $-$1.49(0.06) \\
Q 0841$+$129      & 2.476  & $-$1.79(0.10) & $-$1.40(0.10) &   $-$2.69(0.10) & 7.29 &  $-$2.15(0.04)     & $-$1.55(0.10) & $-$1.58(0.10) \\
Q 0913$+$072      & 2.618  & $-$2.72(0.10) & $-$2.45(0.10) &  $<$$-$3.73       & 6.24 &  $<$$-$2.14          & $-$1.66(0.10) & $-$2.57(0.10) \\
Q 1108$-$077      & 3.608  & $-$1.96(0.07) & $-$1.69(0.08) &  $<$$-$3.36       & 7.00 &  $<$$-$2.53          &               & $-$1.57(0.07) \\
Q 1337$+$113      & 2.508  & $-$2.23(0.05) & $-$1.91(0.11) &   $-$3.11(0.11) & 6.78 &  $-$2.06(0.14)     &               & $-$1.84(0.06) \\
Q 1337$+$113      & 2.796  & $-$2.14(0.08) & $-$1.95(0.10) &   $-$2.84(0.09) & 6.74 &  $-$1.61(0.09) &               & $-$1.84(0.09) \\
Q 1340$-$136      & 3.118  & $-$1.59(0.08) & $-$1.22(0.08) &   $-$2.60(0.08) & 7.47 &  $-$2.24(0.03)     & $-$1.41(0.08) & $-$1.18(0.08) \\
Q 1409$+$095      & 2.456  & $-$2.43(0.08) & $-$1.89(0.08) &  $<$$-$2.85       & 6.80 &  $<$$-$1.82          & $-$1.74(0.08) & $-$2.17(0.08) \\
Q 1409$+$095      & 2.668  & $-$1.51(0.08) & $-$1.31(0.08) &   $-$2.13(0.08) & 7.38 &  $-$1.68(0.03)     & $-$1.40(0.09) & $-$1.28(0.08) \\
Q 1946$+$769$^b$  & 2.844  & $-$2.50(0.06) & $-$2.14(0.06) &   $-$3.51(0.07) & 6.55 &  $-$2.23(0.04)     &               & $-$2.21(0.06) \\
Q 2059$-$360      & 3.083  & $-$1.97(0.08) & $-$1.58(0.09) &   $-$2.86(0.08) & 7.11 &  $-$2.14(0.04)     & $-$1.76(0.09) & $-$1.66(0.09) \\
Q 2332$-$094      & 3.057  & $-$1.60(0.07) & $-$1.24(0.07) &   $-$2.60(0.08) & 7.45 &  $-$1.94(0.05) & $-$1.32(0.08) &               \\
QXO 0001$^b$      & 3      &$<$$-$1.08       & $-$1.62(0.05) &   $-$3.22(0.06) & 7.07 &  $-$2.46(0.05)     &               & $-$1.79(0.05)  \\
\hline
      \end{tabular}}
  \medskip
\par
$^a$ Molaro et~al. (2001); $^b$ Prochaska et~al. (2002); $^c$$\sigma$~=~$\sigma$([O/H]);
$^d$ errors are taken as square root of the geometrical mean of the variances of $N$(N~{\sc i}) and $N$(O~{\sc i}), as given in
Table~\ref{table1}, except for Q 0102$-$190, Q 1337$+$113 at $z_{\rm abs}$~=~2.796 and  Q 2332$-$094 for which we consider only
the main components of the systems to calculate the [N/O] ratio (see text in Sect. 3).
\end{table}