\begin{table}%t6
\caption{\label{rotational}Rotational temperature and beam-averaged column density.}
%\centering
\par
\begin{tabular}{l c c}         
\hline\hline      \noalign{\smallskip}            
   Species   & $T_{{\rm rot}}$ (K)  & $N$ (cm$^{-2}$)   \\    
\hline
    SiS      & 85.8 (11.1)    & 4.46 $\times$ 10$^{15}$ (1 $\times$ 10$^{15}$)    \\
    SiO      & 17.1 (1.0)     & 8.24 $\times$ 10$^{15}$ (1 $\times$ 10$^{15}$)   \\
    SO       & 27.2 (2.7)     & 6.35 $\times$ 10$^{15}$ (2 $\times$ 10$^{15}$)   \\
    SO$_2$   & 67.5 (6.8)     & 2.02 $\times$ 10$^{16}$ (4 $\times$ 10$^{15}$)  \\
 $^{30}$SiO  & 68.6 (82.3)    & 2.48 $\times$ 10$^{14}$ (4 $\times$ 10$^{14}$)   \\
 $^{29}$SiO  & 30.0 (15.5)    & 7.12 $\times$ 10$^{14}$ (9 $\times$ 10$^{14}$)     \\
   CS        & 33.9 (4.7)     & 8.89 $\times$ 10$^{14}$ (2 $\times$ 10$^{14}$)   \\
   HCN       & 8.3 (0.5)      & 2.27 $\times$ 10$^{15}$ (5 $\times$ 10$^{14}$)     \\
\hline                                   %inserts single line
\end{tabular}
\tablefoot{The temperature and the density were determined from the rotational diagram analysis. The uncertainties
 are given within parenthesis (no systematic errors included).}\vspace*{1.5mm}
\end{table}