\begin{table}%t2
\caption{\label{t:backends}Spectral resolution and bandwidth available with the receiver/backend combinations used.}
%\centering
\small
\begin{tabular}{lcrr@{\hspace{2em}}rrl}
\hline\hline\noalign{\smallskip}
&&\multicolumn{2}{c}{Channel spacing} & \multicolumn{2}{c}{Bandwidth} & \\
receiver & backend & MHz &\km & MHz & \km & transition \\
\hline
     & VESPA & 1.25 & 1.6 & 288 & 370 & \Ha{30}, \HCOpd  \\
HERA & WILMA & 2.0  & 2.6 & 930 & 1200& \Ha{30}, \HCOpd \\
     & FB    & 4.0  & 5.2 & 1024& 1300& \Ha{30}\\
     \hline
A~100, B~100 & VESPA & 0.078 & 0.26 & 140 & 480 & \Ha{39}, \HCOpe  \\
\hline\noalign{\smallskip}
A~230, B~230 & VESPA & 0.313 & 0.36 & 220 & 249 & \HdzCO, \HCazO \\
\hline
\end{tabular}
\tablefoot{VESPA and WILMA are autocorrelators, FB is a low resolution filterbank.}
\vspace*{9mm}
\end{table}