\begin{table}%t1
\caption{\label{table-lineparameters}Observed line parameters of CN$^-$.}
\small %\centering
\par
\begin{tabular}{crllc}
\hline \hline\noalign{\smallskip}
\multicolumn{1}{c}{}           & \multicolumn{1}{c}{$\nu_{\rm 0}$\tablefootmark{a}} & \multicolumn{1}{c}{$\nu_{\rm obs}$} & \multicolumn{1}{c}{$v_{\rm exp}$\tablefootmark{b}} & \multicolumn{1}{c}{$\int$$T_{\rm A}^*$${\rm d}$v} \\
\multicolumn{1}{c}{Transition} & \multicolumn{1}{c}{(MHz)}         & \multicolumn{1}{c}{(MHz)}           & \multicolumn{1}{c}{(km s$^{-1}$)} & \multicolumn{1}{c}{(K~km~s$^{-1}$)} \\
\hline\noalign{\smallskip}
$J$ = 1--0 & 112 264.8  & 112 264.8\tablefootmark{c}  & 14.5\tablefootmark{c}   & $\sim$0.07(3)\tablefootmark{d}\\
$J$ = 2--1 & 224 525.1  & 224 525.4(5)   & 14.5\tablefootmark{c}  & 0.23(7)\tablefootmark{e} \\
$J$ = 3--2 & 336 776.4  & 336 777.0(12)  & 15.0(10)  & 0.13(2) \\
\hline
\end{tabular}
\tablefoot{Number in parentheses are 1$\sigma$ uncertainties in
units of the last digits. \tablefoottext{a}{Frequencies derived from the
rotational constants reported by \citet{ama08}.} \tablefoottext{b}{$v_{\rm exp}$
is the half width at zero level.} \tablefoottext{c}{Fixed value.} \tablefoottext{d}{Highly
uncertain estimate. Line severely blended with a strong C$_6$H~line.} \tablefoottext{e}{Line blended with a SiC$_2$~$\nu_3=2$~line.}}
\end{table}