\begin{table}%t1
%\centering
\par
\caption{A summary of the absorbing columns toward \mcg. Reference 1 =
\citet{ewl89}, 2 = \citet{rwfc97}, 3 = \citet{lee02b}.}\label{tab:columns}
\begin{tabular}{ccccc}
\hline\hline
Type & $N_{{\rm H}}$ (cm$^{-2}$) & Derived from & Origin & Ref. \\ \hline
Cold & $4.06 \times 10^{20}$  & soft X-ray cutoff & Galaxy &
1 \\
?? & $4 \times 10^{21}$ & reddening & intrinsic & 2 \\
Warm & $\sim$$10^{23}$ & soft X-ray edges and lines & intrinsic &
3 \\
\hline
\end{tabular}
\end{table}