\begin{table}%t1
\caption{\label{lick_sch}Linear fit coefficients to convert the Schiavon (S05) indices into the Lick system.}
%\centering
\small
  \begin{tabular}{lrrr}
    \hline\hline\noalign{\smallskip}
    Index & $a$& $b$ &rms \\
    \hline
Mg2     &  0.008  & 1.029  & 0.004 \\
Mgb	& --0.034  & 1.145  & 0.098 \\
Fe5270  &  0.761  & 0.551  & 0.199 \\ 
Fe5335  & --0.079  & 0.704  & 0.275 \\
\hline
\end{tabular} 
\end{table}