\begin{table}%t2
\caption{Summary of the coefficients relevant to Eq.~(\ref{eq:R}). The coefficients in Cols.~$2{-}8$ are given in units of~\AA. Columns~$9{-}14$ are given in~dex/Gyr. Note that for the higher-order Balmer~indices Col.~5 gives the arithmetic mean of the uncertainties for cool and warm stars \citep[see Tables~3 and~4 in][]{worthey97}.} \label{tab:abcdBalmer}
%\centering
\par
\begin{tabular}{lrrrcccccccccc}
\hline\hline
 index & $\eta$ & $\zeta$ & $\gamma$ & $\delta$ & ${\cal D}_{-1.35}$ &
${\cal D}_{0.0}$ & $\langle{\cal D}_{\rm Z}\rangle$ & ${\cal S}_{0.3,-1.35,3}$ &
${\cal S}_{0.3,-1.35,13}$ & ${\cal S}_{0.3,0.0,3}$ & ${\cal S}_{0.3,0.0,13}$ &
$\langle{\cal S_{\rm \alpha,Z,t}}\rangle$ & $\cal R$ \\  
1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 & 13 & 14\\
\hline
H$\beta$        &  0.20 & 0.232 & 0.22 & 1.30 & 2.55 & 2.68 & 2.62 & 0.382 & 0.137 & 0.408 & 0.102 & 0.257 & 0.497 \\
H$\gamma_{\rm A}$&  0.28 & 0.722 & 0.48 & 1.78 & 7.75 & 11.01& 9.38 & 0.283 & 0.068 & 0.227 & 0.036 & 0.154 & 0.722 \\
H$\gamma_{\rm F}$&  0.28 & 0.448 & 0.33 & 1.34 & 4.55 & 5.83 & 5.19 & 0.291 & 0.072 & 0.123 & 0.050 & 0.134 & 0.471 \\
H$\delta_{\rm A}$   &  0.27 & 1.043 & 0.64 & 1.27 & 5.73 & 9.11 & 7.42 & 0.259 & 0.045 & 0.180 & 0.032 & 0.129 & 0.537 \\
H$\delta_{\rm F}$   &  0.28 & 0.790 & 0.40 & 1.18 & 3.83 & 4.47 & 4.15 & 0.281 & 0.052 & 0.114 & 0.036 & 0.121 & 0.334 \\
\hline
\end{tabular}
\end{table}