\begin{table}%t1
\caption{\label{ch3_mosaic_info.tab}Characteristics of the GEMINI data set.  Observing dates
and times are given for each of the 12~h observing runs, which have been indicated by their shortest baseline length. We calculated the conversion factor between mJy/beam and K at 345~MHz, the average of the $\lambda^2$~sampling of the (usable) frequency channels in our data set.}
%\centering
\small
\begin{tabular}{lcccccc}
\hline\hline
Central position      & \multicolumn{6}{l}{ ($\alpha,\delta$)$_{{\rm 2000}}$ = (109\degr, 36.5\degr); ($l,b$) = (181\degr, 20\degr) } \\
Mosaic size           & \multicolumn{6}{l}{9\degr\ $\times$ 9\degr}  \\
Pointings             & \multicolumn{6}{l}{7 $\times$ 7}\\
Frequencies           & \multicolumn{6}{l}{324--387 MHz} \\
                      & \multicolumn{6}{l}{202 independent frequency channels (Hamming taper)} \\
Resolution   & \multicolumn{6}{l}{2.76\arcmin\ $\times$ 4.70\arcmin} \\
Stokes $V$ noise level  & \multicolumn{6}{l}{6.2 mJy (2.0 K)} \\  
$\mathcal{R}$\ noise level & \multicolumn{6}{l}{0.5 mJy (0.14 K)} \\  
Conversion Jy--K & \multicolumn{6}{l}{1 mJy/beam = 0.32 K (at 345 MHz)} \\ 
\hline
Shortest baseline (m)    & 36 & 48 & 60 & 72 & 84 & 96 \\
Observing date & \hspace{-1mm}03/01/17\hspace{-1mm} & \hspace{-1mm}03/01/21\hspace{-1mm} & \hspace{-1mm}02/12/18\hspace{-1mm} & \hspace{-1mm}02/12/05\hspace{-1mm} & \hspace{-1mm}03/01/22\hspace{-1mm} & \hspace{-1mm}03/01/13\hspace{-1mm} \\
\hspace{3mm} (yy/mm/dd) \\
Start time (UT) & 17:04 & 16:37 & 18:45 & 19:36 & 16:39 & 17:32 \\
End time (UT) & 05:04 & 04:36 & 06:43 & 07:34 & 04:37 & 05:31 \\ 
\hline
\end{tabular}
\end{table}