\begin{table}%t11
\par
\caption{Comparison with the literature.\label{table11}}
%\centerline
{\small{
\begin{tabular}{lcrrr}
\hline\hline
\multicolumn{1}{c}{Index}
&\multicolumn{1}{c}{$N_{\rm gal}$}
& \multicolumn{1}{c}{Offset}
& \multicolumn{1}{c}{Dispersion}
& \multicolumn{1}{c}{Units}
 \\
 \hline
 & & G93 + Long98 & & \\
\hline
        Hb     &    6 &    0.171 &   0.886 & \AA\\
       Mg$_2$   &    6 &   --0.006 &   0.014  & mag \\
       Mgb   &    6 &    0.078 &   0.458 & \AA \\ 
    Fe5270  &    6 &    0.208 &   0.334 & \AA \\ 
    Fe5335  &    6 &   0.160 &   0.348 & \AA  \\ 
       Mg$_1$   &    6 &  --0.007 &   0.011 & mag \\ 
 \hline
 & & Trager et~al. (1998) & & \\
\hline
        Hb    &   20   &  --0.031 &   0.405 & \AA \\
       Mg$_2$   &    20  &  0.004  &  0.016  & mag \\
       Mgb   &    20  &  0.218  &  0.321  &\AA \\
    Fe5270  &     21 &  0.051 &   0.333 & \AA \\
    Fe5335   &    21 &  --0.038  &  0.376 &\AA \\
       Mg$_1$    &   20  & --0.002   & 0.013 & mag \\
     G4300   &    21 &   0.463  &  0.946& \AA \\
    Ca4227   &    21 &   0.519  & 0.757 &\AA \\
 \hline
 & & Beuing et~al. (2002)& & \\
\hline
        Hb    &   11 &   --0.059  &  0.271 &  \AA \\
       Mg$_2$   &    11 &   0.018  &  0.025 & mag \\       
       Mgb   &    11 &   0.470   & 0.628 &\AA \\
    Fe5270  &    11 &   0.339 &   0.603 &\AA \\
    Fe5335  &    11 &   0.075  &  0.455 &\AA \\
       Mg$_1$   &    11  &  0.011   & 0.018& mag \\
    \hline
\end{tabular}}}
\par
\medskip
Offsets and dispersions of the residuals between our data and the literature. 
Dispersions are 1$\sigma$ scatter of the residuals.
Beuing et~al. (2002) do not compute G4300 and Ca4227 indices. For G4300 and Ca4227 indices
Gonz\' alez (1993) and Longhetti et~al. (1998) used a (slightly) different definition than 
Trager et~al. (1998)  and consequently comparisons are not reported in the table. The 
comparison for H$\beta$ index between our data and those of Trager et~al. (1998) and
Beuing et~al. (2002) are made using uncorrected data. 
\end{table}