\begin{table}%t2
\caption{\label{obs_params}Plateau de Bure Interferometer (PdBI), Submillimeter Array (SMA), and IRAM 30~m observation parameters.} 
%\centerline
{                         
\small\begin{tabular}{c|c|c|c|c c c|c|c|c}     
\hline\hline                 
Obs & Date & Freq & Configuration 	& \multicolumn{3}{c|}{Calibrators} & Beam & rms$_{\rm cont}$ & rms$_{\rm line}$ \\   
&      & [GHz]  & 			& Bandpass & Phase \& Amplitude & Flux 	& [$''$] 	& [mJy/bm] & [mJy/bm]\\
%gain=phase and amplitude; flux=flux density
\hline
& 23 May 2006 &  89 & D	     & 3C273   & NRAO 530 \& 1741-038 & MWC 349 &     	  &     & \\ %seeing 1.5''
PdBI & 03 Apr. 2007 &  89 & C & 3C84    & NRAO 530 \& 1741-038 & MWC 349 &         &     & \\ %seeing 0.78''
& 05 Apr. 2007 &  89 & C	     & 3C273   & NRAO 530 \& 1741-038 & MWC 349 &         &     & \\ %seeing 0.75''
& 	    &  89 & combined & 	       &		      &		& 6.7$\times$3.1 & 0.15 & 11\\
\hline                        % inserts single horizontal line .15 from both go nice and pol/mean
& 30 May 2006 & 230 & extended & Uranus  & 1911-201 \& 1733-130 & Uranus & & &\\ %1.4x1.3  & 2.5 \\  %rms from imstat on .rest file, beam from prthd on .rest file in 060530/2ndtry
& 08 Aug. 2006 & 230 & compact  & Uranus  & 1911-201 \& 1733-130 & Uranus & & &\\ %3.6x3.3  & 9.8 \\ %aida1:18223-3/2ndtry/cont.rest
SMA & 	    & 230 & combined &	       &		      &	       & 1.4$\times$1.3  & 1.6	& 65\\ %see notes on page 125 of notebook. 1.6 from pol/mean. 1.9 from imstat
& 24 Jul. 2007 & 279 & compact  & Uranus  & 1911-201             & Uranus & & &\\ %2.5x1.1  & 4.8 \\ %usb data
& 27 Aug. 2007 & 279 & extended & 3C454.3 & 1733-130             & Uranus & & &\\ %0.8x0.7  & 3.9 \\ %used 3C454.3 for rel. levels; lsb data
& 	    & 279 & combined & 	       &		      &	       & 1.3$\times$1.3  & 2.2	& 85\\ %I set this to a circle.  Before (usb), it was 1.3x0.9. cont_comb: imstat-2.6 pol/mean-2.2
\hline
30~m & 24 Feb 2007 & 230 & \multicolumn{4}{c|}{on-the-fly mapping} & 11 & & 0.17$^a$\\ %see text for determination comments; used to have 0.22, can't reproduce.
\hline
%\multicolumn{10}{l}{$^a$Units: K at 0.4 km s$^{-1}$ resolution averaged over the spectra in the central 4$\arcsec\times$4$\arcsec$ of the map.}
\end{tabular}}
\medskip
\par
%~\\ %If the table is shorter and it starts writing font next to the table instead of below.
Entries include the observatory at which the data were taken, the date of observation, the frequency observed, the array configuration, the calibrators, the synthesized beam obtained after inverting and cleaning the data, the 1$\sigma$ continuum noise level, and the 1~km~s$^{-1}$~rms.\\
$^a$ Units: K at 0.4~km s$^{-1}$ resolution averaged over the spectra in the central 4$\arcsec\times 4\arcsec$ of the map. 
\end{table}