\begin{table}%t2
\caption {\label{Opacity-par}Observed parameters of the $J=3\to2$ lines of 
H$^{13}$CO$^+$, HC$^{18}$O$^+$, H$^{13}$C$^{18}$O$^+$, HN$^{13}$C, 
H$^{15}$NC and H$^{15}$N$^{13}$C toward L1448-mm (0, 0) and (0,~--10). }  
%\centerline
 {\begin{tabular}{lcccccc} 
\hline \hline
\noalign{\smallskip}
&  \multicolumn{3}{c}{(0, 0)} & \multicolumn{3}{c}{(0, --10)}  \\ \cline{2-4} \cline{5-7} 
& $V_{\rm LSR}$& $\Delta v$ & $T_{\rm A}^*$ & $V_{\rm LSR}$& $\Delta v$ & $T_{\rm A}^*$  \\
 Line &  (km s$^{-1}$) & (km s$^{-1}$) & (K) &  (km s$^{-1}$) & (km s$^{-1}$) & (K) \\ \hline
H$^{13}$CO$^+$\tablefootmark{a} & 4.5(2) & 0.9(3) & 0.23(9) &  $\sim$4.7 & ... & $\la$0.168  \\
& 5.35(1) & 0.71(3) & 2.21(9) &  5.52(4) & 0.90(8) & 0.65(6) \\
HC$^{18}$O$^+$ & $\sim $4.7 & ... & $\la $$0.195$\tablefootmark{b} & $\sim$$4.7$ & ... & $\la$$0.195$  \\
&  $\sim$$ 5.2$ & ... & $\la $$0.195$ &  $\sim$$5.2$ & ... & $\la$$0.195$\\
H$^{13}$C$^{18}$O$^+$ & $\sim $$4.7$ & ... & $\la$$ 0.090$&$\sim$$ 4.7$ & ... & $\la$$0.087$\\
& $\sim$$ 5.2$ & ... & $\la$$ 0.090$&$\sim$$ 5.2$ & ... & $\la$$0.087$\\
HN$^{13}$C\tablefootmark{a} &4.75(5)&0.6(1)&0.35(9)&$\sim $$4.7$&...& $\la$$0.261$\\
&$\sim$$5.2$&...&$\la$$0.237$&$\sim $$5.2$&...& $\la$$0.261$\\
H$^{15}$NC & $\sim$$4.7$&...& $\la$$0.093$& ...& ... & ... \\
& $\sim$$5.2$&...& $\la$$0.093$& ...& ... & ... \\
H$^{15}$N$^{13}$C&$\sim$$4.7$ & ... & $\la$$0.198$ &  $\sim$$4.7$ & ... & $\la$$ 0.207$ \\
&$\sim$5.2 & ... & $\la$$0.198$ &  $\sim$$5.2$ & ... & $\la $$0.207$\\ \hline
\end{tabular}}
\par
\tablefoot{
\tablefoottext{a}{These molecular line transitions were taken from JS06.}
\tablefoottext{b}{The upper limits of the line intensities correspond 
to the $3\sigma$ noise level.}}
\end{table}