\begin{table}%t3
%\centering
\par
\caption{Photoelectric absorption results towards \src\ (see
Table~\ref{tab:spec} for the continuum emission parameters). The
edge energies were fixed at~0.54, 0.71 and 0.87~keV for O, Fe and
Ne, respectively. $\tau_{\rm edge}$ is the absorption depth.
$N_{\rm Z}$ is the element column density (in units of
10$^{17}$~\hcm) calculated using the Henke et~al.~(\cite{he:93})
cross sections. $N_{\rm H}$ is the hydrogen column density implied
by $N_{\rm Z}$, in units of 10$^{21}$~\hcm, assuming the ISM
abundances of Wilms et~al.~(\cite{w:00}).\label{tab:edge}}
\begin{tabular}[c]{llllll}
\hline\hline\noalign{\smallskip}
Model  & \mc{1}{c}{Edge} &\mc{1}{c}{$\tau_{\rm edge}$} &\mc{1}{c}{$N_{\rm Z}$}      &\mc{1}{c}{$N_{\rm H}$} &\mc{1}{c}{Ne/O} \\
\hline
\multicolumn{3}{l}{Observation 1}  \\
\cline{1-2}
dbb+    & Ne K & $\rm 0.19^{+0.04} _{-0.05}$ &$\rm 5.2^{+1.1}_{-1.4}$  &$\rm 6.0^{+1.3}_{-1.6}$ & \\
pow        & O K  & $\rm 2.07^{+0.12}_{-0.12}$  & $\rm 36.4^{+2.1}_{-2.1}$  & $\rm 7.4^{+0.4}_{-0.4}$  & $\rm 0.14^{+0.03}_{-0.04}$ \\
           & Fe L & $\rm 0.54^{+0.06}_{-0.06}$ & $\rm 0.77^{+0.09}_{-0.09}$ & $\rm 2.9^{+0.3}_{-0.3}$  &  \\
\hline
bb+   & Ne K & $\rm 0.20 ^{+0.04} _{-0.04}$ & $\rm 5.5^{+1.1}_{-1.1}$  & $\rm 6.3^{+1.3}_{-1.3}$ &   \\
pow        & O K  & $\rm 2.17 ^{+0.12} _{-0.12}$ & $\rm 38.2^{+2.1}_{-2.1}$  & $\rm 7.8^{+0.4}_{-0.4}$ & $\rm 0.14^{+0.03}_{-0.03}$  \\
           & Fe L & $\rm 0.57 ^{+0.06} _{-0.06}$ & $\rm 0.81^{+0.09}_{-0.09}$  & $\rm 3.0^{+0.3}_{-0.3}$  &   \\
\hline
dbb+    & Ne K & $\rm 0.18 ^{+0.04} _{-0.05}$ & $\rm 5.0^{+1.1}_{-1.1}$  & $\rm 5.7^{+1.3}_{-1.6}$& \\
+ctt    & O K  & $\rm 1.76 ^{+0.14} _{-0.13}$ & $\rm 31.0^{+2.5}_{-2.5}$ & $\rm 6.3^{+0.5}_{-0.5}$ & $\rm 0.16^{+0.04}_{-0.05}$    \\
        & Fe L & $\rm 0.46 ^{+0.07} _{-0.06}$ & $\rm 0.66^{+0.10}_{-0.10}$& $\rm 2.4^{+0.4}_{-0.3}$ &  \\
\hline
%\hline
\multicolumn{3}{l}{Observation 2}  \\
\cline{1-2}
dbb+    & Ne K & $\rm 0.27 ^{+0.05}_{-0.05}$  & $\rm 7.4^{+1.4}_{-1.4}$  & $\rm 8.5^{+1.6}_{-1.6}$ &    \\
pow        & O K  & $\rm 2.32 ^{+0.13}_{-0.13}$ &$\rm 40.8^{+2.3}_{-2.3}$& $\rm 8.3^{+0.5}_{-0.5}$&$\rm 0.18^{+0.04}_{-0.04}$ \\
           & Fe L & $\rm 0.70 ^{+0.07}_{-0.07}$ &$\rm 1.0^{+0.1}_{-0.1}$& $\rm 3.7^{+0.4}_{-0.4}$ &   \\
\hline
bb+     & Ne K & $\rm 0.29 ^{+0.05}_{-0.05}$ & $\rm 8.0^{+1.4}_{-1.4}$ &$\rm 9.2^{+1.6}_{-1.6}$  &   \\
pow     & O K  & $\rm 2.41 ^{+0.12}_{-0.12}$ & $\rm 42.4^{+2.1}_{-2.1}$& $\rm 8.7^{+0.4}_{-0.4}$ & $\rm 0.19^{+0.03}_{-0.03}$  \\
        & Fe L & $\rm 0.73 ^{+0.07}_{-0.07}$ & $\rm 1.0^{+0.1}_{-0.1}$  & $\rm 3.9^{+0.4}_{-0.4}$ &   \\
\hline
dbb+    & Ne K & $\rm 0.25 ^{+0.04} _{-0.08}$ & $\rm 6.9^{+1.1}_{-2.2}$  & $\rm 7.9^{+1.3}_{-2.5}$  &   \\
ctt     & O K & $\rm 1.90 ^{+0.14} _{-0.22}$ & $\rm 33.5^{+2.5}_{-3.9}$  & $\rm 6.9^{+0.5}_{-0.8}$ & $\rm 0.21^{+0.04}_{-0.07}$ \\
        & Fe L & $\rm 0.60 ^{+0.07} _{-0.11}$ & $\rm 0.86^{+0.10}_{-0.16}$  & $\rm 3.2^{+0.4}_{-0.4}$ &  \\
\end{tabular}
\end{table}