\begin{table}%t1
\caption{\label{conti}Measured rms (at a frequency resolution of 1.1~MHz) and assumed continuum values  for the different  transitions  (in $T_{\rm mb}$ scale). }              
\small     
%\centering
\par
\begin{tabular}{c c c c c}         
\hline\hline   \noalign{\smallskip}               
HIFI band  &  Transition & Frequency  & rms & Continuum \\     
 & ($N _J{-}N\arcmin_J\arcmin$) & (GHz) & (mK) & (mK)\\
\hline                       
1a & ND  (0$_1$--1$_2$) & 522.1 &  12 & 203 $\pm$ 22\\      
1a & ND  (0$_1$--1$_1$) & 546.2 &  15 & 230 $\pm$ 24\\
3b & NH  (0$_1$--1$_0$) & 946.5 &  58 & 832 $\pm$ 80\\
4a & NH  (0$_1$--1$_2$) & 974.5 & 49 & 892 $\pm$ 143\\
4a & NH  (0$_1$--1$_1$) & 1000.0 & 50 & 942 $\pm$ 146\\ 
\hline                                   
\end{tabular}
\vspace*{-2mm}
\end{table}