\begin{table}%ta1
%\begin{center}
\par
\caption{\label{SIMBAD}List of the sources in the sampled field, from the SIMBAD Astronomical Database. Columns~(1)--(2): coordinates (J2000.0); Col.~(3): distance from the peak emission of the associated clump (see Sect.~\ref{identif}); Col.~(4): References.}\vspace*{-2mm}
\begin{tabular}{c c c c  c c c c}
\hline\hline\noalign{\smallskip}
\multicolumn{2}{c}{Position} & Distance & Ref.   &     \multicolumn{2}{c}{Position} & Distance & Ref.  \\
RA[J2000.0] & Dec[J2000.0] & (arcsec) & & RA[J2000.0] & Dec[J2000.0] & (arcsec) & \\
(1)&(2)&(3)&(4)&(1)&(2)&(3)&(4)\\
\hline
\multicolumn{4}{c}{{HII Regions}}        &                \multicolumn{4}{c}{{H$_2$O Masers}}   \\ 
18:27:38.29  &  --11:56:29.4   &    16.8 &  1      &           	     18:27:38.00  &  --11:56:36.0  &  21.0 &  13     \\ 
18:27:37.34  &  --11:56:32.4   &    17.2 &  2, 3, 7  &	       	     18:27:37.80  &  --11:56:37.0  &  21.5 &  13     \\ 
18:27:37.30  &  --11:56:32.3   &    17.3 &  1  	   &	       	     18:27:38.00  &  --11:56:37.0  &  22.0 &  13     \\ 
18:27:38.20  &  --11:56:31.4   &    17.8 &  2, 3    &	       	     18:27:37.40  &  --11:56:38.0  &  22.6 &  13     \\ 
18:27:38.02  &  --11:56:32.9   &    18.1 &  1  	   &	       	     18:27:38.20  &  --11:56:37.0  &  22.9 &  13     \\ 
18:27:38.01  &  --11:56:34.9   &    20.0 &  3  	   &	       	     18:27:37.60  &  --11:56:41.0  &  25.3 &  13     \\ 
18:27:38.08  &  --11:56:35.5   &    20.9 &  4  	   &	       	     \multicolumn{4}{c}{{OH Masers}}       \\ 
18:27:37.70  &  --11:56:37.0   &    21.3 &  10     &                 18:27:37.80  &  --11:56:27.0  &  11.6 &  16     \\ 
18:27:38.18  &  --11:56:36.0   &    21.9 &  5  	   &	       	     18:27:16.20  &  --11:53:36.0  &  13.3 &  17     \\ 
18:27:38.30  &  --11:56:35.4   &    22.0 &  6  	   &	       	     \multicolumn{4}{c}{{Methanol Masers}} \\ 
18:27:38.09  &  --11:56:39.6   &    24.8 &  1  	   &	       	     18:27:37.50  &  --11:55:58.0  &  17.8 &  12     \\ 
18:27:38.14  &  --11:56:39.7   &    25.1 &  2,3    &	             18:27:38.09  &  --11:56:39.5  &  24.7 &  14     \\ 
18:27:38.16  &  --11:56:40.2   &    25.7 &  7      &	       	     18:27:54.00  &  --11:52:00.0  &  33.4 &  15     \\ 
18:27:38.00  &  --11:56:42.0   &    26.9 &  8, 10, 11  &         	     18:27:17.30  &  --11:53:46.0  &  6.1  &  12     \\  
18:27:37.80  &  --11:56:48.0   &    32.4 &  9  	   &                 18:27:14.40  &  --11:53:25.0  &  41.9 &  12, 15  \\
\cline{5-8}							     
18:27:38.71  &  --11:56:44.0   &    32.4 &  1      &&&&\\   
18:27:38.79  &  --11:56:44.7   &    33.6 &  2,3    &&&&\\   
18:27:17.20  &  --11:53:45.0   &     4.4 &  10     &&&&\\     
18:27:16.30  &  --11:53:30.0   &    15.7 &  8      &&&&\\     
\cline{1-4}							     
\end{tabular}\vspace*{-1mm}
\tablebib{(1)~\cite{ho1981}; (2) \cite{debuizer2003}; (3)~\cite{furuya05}; (4) \cite{kurtz2004}; (5) \cite{becker1994}; (6)~\cite{kolpak2003}; (7) \cite{forster&caswell2000}; (8) \cite{lockman1989}; (9) \cite{chini1987}; (10) \cite{walsh1998}; (11)~\cite{testi1998}; (12)~\cite{caswell1995}; (13) \cite{hofner1996}; (14)~\cite{valtts2000}; (15)~\cite{szymczak2000}; (16) \cite{caswell1983}; (17) \cite{forster1989}. }
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\vspace*{-5mm}
\end{table}