\begin{table}%t5
\caption{Fractional abundances with respect to H$_2$, for some observed hot cores$^{a}$.}
\label{tab5}
\small%\centerline
{
\begin{tabular}{l c c c c c}
\hline\hline
 & & & & & \\[-8pt]
Species              && Orion Compact Ridge$^{b}$ & Orion Hot Core$^{b}$ & IRAS 16293$^{c}$  & IRAS 4A$^{d}$ \\
\hline
HCOOCH$_3$-A         && 3$(-8)$                   & 1.4$(-8)$            & $1.7 \pm 0.7(-7)$ & $3.4 \pm 1.7(-8)$ \\
HCOOCH$_3$-E         &&                           &                      & $2.3 \pm 0.8(-7)$ & $3.6 \pm 1.7(-8)$ \\
HCOOH                && 1.4$(-9)$                 & 8$(-10)$             & $\sim$$6.2(-8)$   & $4.6 \pm 7.9(-9)$ \\
CH$_3$OCH$_3$        && 1.9$(-8)$                 & 8$(-9)$              & $2.4 \pm 3.7(-7)$ & $\leq$$2.8(-8)$ \\
H$_2$CO              && 4$(-8)$                   & 7$(-9)$              & $6.0(-8)$$^{e}$   & $2(-8)$$^{f}$ \\
CH$_3$OH             && 4$(-7)$                   & 1.4$(-7)$            & $3.0(-7)$$^{e}$   & $\leq$$7(-9)$ \\
\hline
\end{tabular}}
\medskip
$^{a}$ $a(b) = a \times 10^{b}$.
$^{b}$~Values from \cite{sutton95a}. Values are given for total HCOOCH$_3$~abundance.
$^{c}$~Values from \cite{cazaux03a}.
$^{d}$~Values from \cite{bottinelli04a}.
$^{e}$~Values from \cite{schoier02a}.
$^{f}$~Values from \cite{maret04a}.
\end{table}