\begin{table}%t1
\caption{Observed line parameters in IRC +10216.}\label{table-lineparameters}
\small%\centerline
 {
\begin{tabular}{lcccc}
\hline \hline
&&&& \\[-8pt]
\multicolumn{1}{c}{}           & \multicolumn{1}{c}{Cal. Freq.} & \multicolumn{1}{c}{Obs. Freq.} & \multicolumn{1}{c}{$v_{\rm exp}$$^a$}     & \multicolumn{1}{c}{$\int$$T_{\rm MB}$d$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}$)} \\
\hline
\multicolumn{5}{l}{PH$_3$} \\
$J_{\rm K}$ = 1$_0$--0$_0$  & 266944.514  &  266944.5(3)    & 14.1(3)  & 1.002(40) \\
\hline
\multicolumn{5}{l}{SiS $v$ = 4} \\
$J$ = 15--14          & 266941.754  &  266942.4(7)    & 4.0(7)   & 0.237(40) \\
$J$ = 14--13          & 249155.372  &  249155.6(4)    & 3.5(4)   & 0.172(40) \\
$J$ = 13--12          & 231366.976  &  231367.2(3)    & 2.7(3)   & 0.256(30) \\
$J$ = 12--11          & 213576.710  &  213576.9(5)    & 3.5(5)   & 0.207(40) \\
\hline
\end{tabular}}
\medskip
N{\sc ote}. Number in parentheses are 1$\sigma$ uncertainties in
units of the last digits. Observed frequencies are given in the
rest frame of IRC~+10216 assuming a systemic velocity of $v_{\rm
LSR}$~= $-$26.5~km~s$^{-1}$.\\
$^a$ $v_{\rm exp}$ is the half width at zero level.
\end{table}