\begin{table}%tc1
  \caption {\label{tab:summary}Conversion factor, $N_0$ (in \dix{12}\cc/(\kkms)), at an
    excitation temperature $\texc=8$~K (see Eq.~(\ref{eq:N0})).}
  %\centerline
 {\begin{tabular}{c c c c c c c c c c}\hline\hline
  \noalign{\smallskip}
    Molecule & Transition & $\nu$\tablefootmark{a} & $\delta v$\tablefootmark{b} & $\beff$\tablefootmark{c} & $B$ & $\mu_0$ & R.I.\tablefootmark{d} &$Q$\tablefootmark{e}& $N_0/\rm R.I.$ \\
    & & MHz & \kms & & MHz & debye & & & \\\hline
    CN &\jone & 113520.414 & 0.052 & 0.74 & 56~693.470 & 1.45 & 0.0184 & 3.3 & 293 \\
    CN &\jtwo & 226882.000 & 0.053 & 0.50 & & \\
    HCN &\jone & 88633.936 & 0.066 & 0.77 & 44~315.976 & 2.9852 & 0.1111 & 4.1 & 16.4 \\
    \thcn &\jone & 108780.201 & 0.063 & 0.77 & 54~353.130 & 1.45 & 0.194 & 3.4 & 29.5 \\
    H\thcn &\jone & 86342.251 & 0.054 & 0.75 & 43~170.127 & 2.9852 & 0.5556 & 4.2 & 3.4 \\
    HN\thc &\jone & 87090.850 & 0.068 & 0.78 & 45~331.980 & 3.05 & 1.000 & 4.0 & 1.7 \\
    HC\fifn &\jone & 86054.9664& 0.067 & 0.78 & 43~027.648 & 2.9852 & 1.000 & 4.2 & 1.9 \\
    \nnhp &\jone & 93171.621 & 0.068 & 0.78 & 46~586.880 & 3.40 & 0.037 & 3.9 & 35.2 \\
    \hline
  \end{tabular}}
\tablefoot {
    \tablefoottext{a}{Frequency of the HFS component considered for which we
    compute the flux $W$.}
  \tablefoottext{b}{Spectral resolution in \kms.}
  \tablefoottext{c}{Beam efficiency. The forward efficiency at 3~mm is
    $\feff=0.95$, and 0.91 at 1.3~mm.}
    \tablefoottext{d}{Relative intensity of the HFS component. The total flux
    in Eq.~(\ref{eq:N0}) is $\wtot=W/$R.I.}
    \tablefoottext{e} {Partition function computed as
    $Q=\dsum_{J=0}^{20}(2J+1)\exp^{-\frac{hBJ(J+1)}{k_{\rm B}\texc}}$,
    where $B$ is the rotational constant.}}
\end{table}