\begin{table}%t4
\caption{Abundances for the two components of the \object{IRAS~2A}
outflow compared to other outflows and protostellar
environments.}\label{tab4}
%\centerline
{
\renewcommand{\arraystretch}{1.2}
\begin{tabular}{lll|llllll}\hline\hline
\setlength{\tabcolsep}{4pt}
Molecule        & \object{IRAS~2A} core$^a$  & \object{IRAS~2A} wing$^a$ & \object{L1157}$^b$ & HH2$^c$ & BHR71$^d$ & IRAS~2A env.$^e$ & IR16293$^{f}$ & L134N$^g$ \\ \hline
CO              & =1$~\times~ 10^{-4}$     & =1$~\times~ 10^{-4}$  & =1$~\times~ 10^{-4}$ & =1$~\times~ 10^{-4}$ & =1$~\times~ 10^{-4}$ & 2$~\times~ 10^{-5}$    & 4$~\times~ 10^{-5}$          & =1$~\times~ 10^{-4}$ \\
CH$_3$OH        & 6.7$~\times~ 10^{-7}$    & 4.8$~\times~ 10^{-6}$ & 2$~\times~ 10^{-5}$  & 2$~\times~ 10^{-8}$  & 2$~\times~ 10^{-7}$  & 2$~\times~ 10^{-9}$    & 3$~\times~ 10^{-7}$$\dagger$ & 8$~\times~ 10^{-9}$  \\ 
CS              & 1.1$~\times~ 10^{-8}$    & 2.7$~\times~ 10^{-8}$ & 2$~\times~ 10^{-7}$  & 7$~\times~ 10^{-10}$ & 6$~\times~ 10^{-9}$  & 3$~\times~ 10^{-9}$    & 3$~\times~ 10^{-9}$          & 1$~\times~ 10^{-9}$  \\
HCN             & 2.2$~\times~ 10^{-9}$    & 4.8$~\times~ 10^{-9}$ & 5$~\times~ 10^{-7}$  & 1$~\times~ 10^{-9}$  & -          & 2$~\times~ 10^{-9}$    & 1$~\times~ 10^{-9}$          & 7$~\times~ 10^{-9}$  \\
HCO$^+$         & 1.3$~\times~ 10^{-9}$    & 2.9$~\times~ 10^{-9}$ & 3$~\times~ 10^{-8}$  & 3$~\times~ 10^{-8}$  & 9$~\times~ 10^{-10}$ & 3$~\times~ 10^{-9}$    & 1$~\times~ 10^{-9}$          & 8$~\times~ 10^{-9}$  \\
H$_2$CO         & 1.7$~\times~ 10^{-8}$    & 1.5$~\times~ 10^{-8}$ & 3$~\times~ 10^{-7}$  & 2$~\times~ 10^{-8}$  & -          & 8$~\times~ 10^{-10}$   & 6$~\times~ 10^{-8}$$\dagger$ & 2$~\times~ 10^{-8}$ \\
N$_2$H$^+$      & 1.8$~\times~ 10^{-9}$    & $\ldots$    & $\ldots$   & -          & -          & 5$~\times~ 10^{-9}$    & 1$~\times~ 10^{-10}$         & 6$~\times~ 10^{-10}$ \\
SiO             & $\ldots$       & 1.1$~\times~ 10^{-7}$ & 7$~\times~ 10^{-8}$  & $\ldots$   & 7$~\times~ 10^{-10}$ & $<$5$~\times~ 10^{-11}$& 5$~\times~ 10^{-9}$$\dagger$ & $<$1$~\times~ 10^{-11}$$^{h}$ \\
SO              & 1.2$~\times~ 10^{-8}$    & 1.2$~\times~ 10^{-7}$ & 3$~\times~ 10^{-7}$  & 8$~\times~ 10^{-9}$  & -          & 3$~\times~ 10^{-9}$    & 3$~\times~ 10^{-7}$$\dagger$ & 6$~\times~ 10^{-9}$  \\ \hline
\end{tabular}}
\medskip
Notes: "-'' Molecule not observed. "$\ldots$'' Molecule observed but not detected.\\
$^a$Core and wing part of IRAS~2A outflow (this paper). \\ 
$^b$The L1157 outflow \citep{bachiller97}. \\
$^c$The HH2 molecular condensation \citep{girart02}. \\
$^d$The BHR71 outflow \citep{garay98}. \\
$^e$The IRAS~2A protostellar envelope \citep{jorgensen02,paperii}.\\
$^f$The IRAS~16293--2422 envelope \citep{schoeier02}. "$\dagger$''
indicate abundances for the warm inner part of the envelope; other
abundances are averages over the entire envelope.\\
$^g$The "C'' position of the L134N dark cloud \citep{dickens00}. \\ 
$^{h}$Derived using upper limits on [SiO]/[HCN] abundance ratio for L134N of 0.0015 from
\cite{ziurys89}.
\end{table}