\begin{table}%t8
%\centering
\par
\caption{\label{tab:abu}Molecular abundances in L1498 and CB246.}
\begin{tabular}{cccc}
\hline\hline
$\alpha,\delta$ offsets & [C$_{2}$H]/[H$_{2}$] & [N$_{2}$H$^{+}$]/[H$_{2}$] & [CO]/[H$_{2}$]\\
$[$$'',''$] & [10$^{-8}$] & [10$^{-10}$] & [10$^{-5}$]\\
\hline
\multicolumn{4}{c}{L1498}\\
$0,0$ & $0.8\pm0.1$ & $1.9\pm0.4$ & $0.5\pm0.1$\\
$-40,20$ & $1.1\pm0.3$ & $1.8\pm0.5$ & $0.8\pm0.2$\\
$60,-40$ & $1.5\pm0.4$ & $2.4\pm0.7$ & $1.1\pm0.3$\\
\hline
\multicolumn{4}{c}{CB246}\\
$0,-15$ & $1.0\pm0.3$ & $3.1\pm1.6$ & $0.9\pm0.2$\\ 
$-60,15$ & $1.2\pm0.5$ & $2.4\pm1.7$ & $1.0\pm0.3$\\
$-60,60$ & $1.0\pm0.3$ & $1.2\pm0.9$ & $1.3\pm0.4$\\
$-30,15$ & $1.0\pm0.2$ & $3.0\pm1.2$ & $1.6\pm0.5$\\ 
\hline
\end{tabular}
\end{table}