\begin{table*}%t5
      \caption{\label{summary}Summary of observations.}
             $$ 
         \begin{array}{p{0.25\linewidth}crrrrrrrrrrrr}
            \hline
            \hline
            \noalign{\smallskip}
		      Star & \multicolumn{4}{c}{\rm {C}_2
		      } & \multicolumn{2}{c}{\rm {CN}}
		      & {\rm~CH} & {\rm~CH}^+ & {\rm C}_2 
		      & {\rm CN} & {\rm~CH} & {\rm~CH}^+ \\ \cline{2-5}
                      & T_{\rm kin} & n & N_{\rm obs} & N_{\rm tot} 
		      & N(0) & N_{\rm tot} & N & N 
      & V_{\rm hel} & V_{\rm hel} & V_{\rm hel} & V_{\rm hel} \\
\par
            \noalign{\smallskip}
            \hline
            \noalign{\smallskip}
\par
  \bdd 1598 & \ldots  &\ldots    &\ldots& \ldots     & 7.9  & 1.15(0.2) & 5.8^{+2}_{-1} & 2.3 (1.0) & \ldots& -14.1 & -16.4 & -13.3\\
  \bd~1661  & 35\pm10 & 700\pm200&  6.2 & 9.3 \pm 1.7& 30.3 & 4.40(0.5) &8.2^{+5}_{-2.3}   & 1.1 (0.7) & -22.1 & -23.3 & -19.4 & -19.5 \\
  \bd~1673  & \ldots  &  \ldots   &  3.75& \ldots     & 19.8 & 2.87(0.5) & {\le}3         & \ldots    & -13.4 & -12.6 & \ldots& \ldots\\
  \bd~1674  & 60\pm10 & 800\pm400&  8.7 & 11.5 \pm2.8& 24.6 & 3.57(0.5) & 11.2^{+9}_{-4}& 1.7 (0.9) & -16.6 & -16.8 & -18.2 & -21.9 \\
  \bd~1675  & 35\pm10 & 700\pm200& 11.05&12.7\pm2.2  & 45.1 & 6.54(0.5) & 12.5^{+8}_{-5}& 1.3 (0.9) & -18.7 & -16.1 & -19.0 & -19.5 \\
\par
            \noalign{\smallskip}
            \hline
         \end{array}
    ~$$ 
   $T_{\rm kin}$ in K;~$n$ in~cm$^{-3}$; 
   $N_{\rm obs}$,~$N_{\rm tot}$,~$N$ in~$10^{13}$~cm$^{-2}$;
   $V_{\rm hel}$ in km s$^{-1}$.
   \end{table*}