\begin{table}%t2  [!h]
\caption{\label{zrec}Recombination redshifts for hydrogen, deuterium and helium.}
%%\centering

\small
\par
\begin{tabular}{l l }
\hline
\hline
 & SBBC\\
\hline
$z_{{\rm rec}} \ ({\rm He^+})$ & 6102\\
$z_{{\rm rec}} \ ({\rm He})$ & 2604\\
$z_{{\rm rec}} \ ({\rm H}) = z_{{\rm rec}} \ ({\rm D})$ & 1425\\
\hline
\end{tabular}
\end{table}