\begin{table}%t12
\caption{\label{tab12}Distribution of sources among the different subgroups identified in 
the sample as a function of their OH expansion velocity and variability 
properties.}
\small%\centering
\par
\begin{tabular}{ccccc}
\hline\hline
Period (days)& Observed& Li~undetected& Li~detected& Too red/not found\\
\hline
$<$400& 12& 10 (84\%) & 1 (8\%) & 1 (8\%)\\
400$-$700& 26& 4 (15\%) & 12 (46\%)& 10 (39\%)\\
$>$700& 17& 1 (6\%) & 1 (6\%) & 15 (88\%)\\
\hline
\end{tabular}
\begin{tabular}{ccccc}
\noalign{\smallskip}
$v_{\rm exp}$(OH) (km s$^{-1}$)& Observed& Li~undetected& Li~detected& Too red/not found\\
\hline
$<$6 & 13& 12 (92\%)& 0 (0\%)& 1 (8\%)\\
6$-$12& 25& 6 (24\%)& 11 (44\%)& 8 (32\%)\\
$>$12& 53& 10 (19\%)& 8 (15\%)& 35 (66\%)\\
\hline
\end{tabular}
\end{table}