\begin{table}%t1
\caption{\label{table:1}Receiver system summary.}            
\small      
%\centering
\par
\begin{tabular}{l l}        
\hline\hline                   
   Frequency range & 279--381~GHz \\
   Receiver noise temperature (DSB) & 50--70 K\\
   Receiver cooling & Closed-cycle at 4 K \\
   System noise temperature (DSB)& 100--200 K (typical) 	\\
   Intermediate frequency & 4--8~GHz \\
   \hline                                   
\end{tabular}
\end{table}