\begin{table}%t7
\caption{Calibration onto the Lick/IDS system.}
\label{Lick_cal}
\small%\centerline
{
\begin{tabular}{c c c c}
\hline
\hline
\noalign{\smallskip}
Index    & Slope ($m$) & Intercept ($q$) & $\chi^2$ \\
\hline
H$\beta$    & 1.05 & --0.23 &  1.7 \\
Mg$b$       & 1.15 & --0.16 & 12.6 \\
Fe5270      & 1.03 & --0.12 & 22.7 \\
Fe5335      & 0.77 &   0.40 &  0.8 \\
H$\gamma_{\rm A}$ & 1.08 & --1.45 &  7.5 \\
H$\delta_{\rm A}$ & 1.03 & --1.09 &  1.4 \\
H$\gamma_{\rm F}$ & 1.00 & --0.51 &  3.3 \\
H$\delta_{\rm F}$ & 1.05 & --0.45 &  2.5 \\
\hline
\end{tabular}}
\medskip
The measured value of a given index $i$ is: $i_{\rm meas}=m\cdot i_{\rm ref}+q$, where~$i_{\rm ref}$ is the value on the Lick/IDS~system.
\end{table}