\begin{table}%t6
\caption{Lick/IDS index definitions$^1$.}
\label{ind_def}
\small%\centerline
{
\begin{tabular}{c c c c}
\hline
\hline
Index & Index band & Blue continuum & Red continuum \\
\hline
H$\beta$    & 4847.875 & 4827.875 & 4876.625 \\
            & 4876.625 & 4847.875 & 4891.625 \\
Mg$b$       & 5160.125 & 5142.625 & 5191.375 \\
            & 5192.625 & 5161.375 & 5206.375 \\
Fe5270      & 5245.650 & 5233.150 & 5285.650 \\
            & 5285.650 & 5248.150 & 5318.150 \\
Fe5335      & 5312.125 & 5304.625 & 5353.375 \\
            & 5352.125 & 5315.875 & 5363.375 \\
H$\gamma_{\rm A}$ & 4319.750 & 4283.500 & 4367.250 \\
            & 4363.500 & 4319.750 & 4419.750 \\
H$\delta_{\rm A}$ & 4083.500 & 4041.600 & 4128.500 \\
            & 4122.250 & 4079.750 & 4161.000 \\
H$\gamma_{\rm F}$ & 4331.250 & 4283.500 & 4354.750 \\
            & 4352.250 & 4319.750 & 4384.750 \\
H$\delta_{\rm F}$ & 4091.000 & 4057.250 & 4114.750 \\
            & 4112.250 & 4088.500 & 4137.250 \\
\hline
\end{tabular}}
\medskip
$^1$ Wavelengths are in angstroms.
\end{table}