\begin{table}%T1
%\centering
\par
\caption{Comparison of Lick indices measured on ELODIE stellar spectra with indices 
    from other databases of stellar spectra, for stars in common. 
    The indices for \citet{Wortheyetal1994} were taken from the table published in their paper. 
    The indices for the Jones library were measured by ourselves (see text).
    The values are the mean offset (ELODIE$-$other~database), the slope 
    of the linear regression and  the dispersion $\sigma$ around it (see Fig.~\ref{figure:lick}).}\label{table:wj}
\begin{tabular}{ l  rcc c@{} rcc}
\hline
\hline
    \multirow{2}*{Index}&\multicolumn{3}{c}{Worthey et al. (1994)} && \multicolumn{3}{c}{Jones library} \\
\cline{2-4}\cline{6-8}
                        &   Offset&    Slope& $\sigma$      &&   Offset&    Slope& $\sigma$    \\
\hline
    Ca4227              &  0.038  &  0.772  &  0.151       &&   0.023  &  0.890  &  0.074\\
     G4300              &  0.025  &  0.910  &  0.333       &&   0.094  &  0.942  &  0.191\\
    Fe4531              &  0.017  &  0.849  &  0.245       &&   &  &\\
    Fe4668              &  0.037  &  0.931  &  0.476       &&   &  &\\
     H$\beta$           &  0.022  &  0.947  &  0.140       &&   0.002  &  0.958  &  0.069\\
    Fe5015              & --0.136  &  0.884  &  0.358       &&  --0.001  &  0.966  &  0.163\\
       Mg1              & --0.001  &  0.878  &  0.011       &&  --0.003  &  0.981  &  0.011\\
       Mg2              &  0.001  &  0.918  &  0.009       &&   0.000  &  0.963  &  0.007\\
       Mg$_{\rm b}$           & --0.037  &  0.877  &  0.204       &&   0.019  &  0.996  &  0.070\\
    Fe5270              & --0.033  &  0.978  &  0.252       &&   0.012  &  0.991  &  0.057\\
    Fe5335              & --0.017  &  0.974  &  0.214       &&   0.003  &  0.947  &  0.061\\
    Fe5406              & --0.003  &  0.937  &  0.203       &&   0.008  &  0.994  &  0.047\\
    Fe5782              & --0.011  &  0.745  &  0.120       &&   &  &\\
       NaD              &  0.073  &  0.895  &  0.314       &&   &  &\\
      TiO1              & --0.001  &  0.889  &  0.010       &&   &  &\\
      TiO2              &  0.001  &  0.909  &  0.007       &&   &  &\\                     
\hline
\end{tabular}
\end{table}