\begin{table}%t2
\caption{Summary of the properties of the \bk\ receiver. The
noise reported in the last column is for a frequency of 1 Hz and
is the average noise of all the detectors at that frequency.
\label{tab:rec}}
%\centerline
 {\small 
\begin{tabular}{ccccc}
\hline\hline
\noalign{\smallskip}
Freq. & Bandwidth & $\#$detectors& Beam {\it FWHM}  & NET$_{\rm CMB}$\\
\hline  
\noalign{\smallskip}
145 GHz & 45 GHz & 8 & $9.95^{\prime}$  & 170 $\mu \rm K\!\sqrt{s}$\\
245 GHz & 80 GHz & 4 & $6.22^{\prime}$ & 320 $\mu \rm K\!\sqrt{s}$\\
345 GHz & 100 GHz & 4 & $6.90^{\prime}$ & 450 $\mu \rm K\!\sqrt{s}$ \\
\hline
\end{tabular}}
\end{table}