\begin{table}%T3
\caption{Intervening \os\ systems toward \he\ A and B, and \rx\ A and B.}\label{table_AB}      
%\centerline
 {
\begin{tabular}{lccccccccc}
\hline\hline   
       &\multicolumn{3}{c}{LOS A}        && \multicolumn{3}{c}{LOS B}\\
       \cline{2-4} \cline{6-8}
 Ion   & $z$      &$\log N$   & $b$      && $z$      &$\log N$   & $b$ &Class&QSO\\ 
\hline
 {\ho} & 2.010370 &14.39(0.01)& 41.3(0.9)&& &    & &II&\he\\ 
 {\cf} & 2.010531 &11.84(0.07)&  5.5(1.6)&&2.010452 &12.88(0.01)&7.6(0.3)\\
 {\os} & 2.010473 &13.39(0.21)&  9.8(6.1)&& &$<$13.7&\\
\hline
 {\ho} &          &           &          && 2.052476 &13.48(0.02)&24.5(1.6)&II&\he\\ 
 {\cf} & 2.053196 &11.77(0.09)&  5.2(2.1)&& 2.052499 &12.84(0.02)&8.9(0.5)\\
 {\os} & 2.052481 &14.01(0.06)&  8.3(1.7)&& 2.052440 &13.77(0.16)&7.4(4.5)\\
\hline
 {\ho} & 2.086492 &$>$15.11(0.01)& 29.9(0.7)&& &    & &II&\he\\ 
 {\cf} & 2.086522 &12.19(0.04)&  9.6(1.1)&& &$<$12.0&\\
 {\os} & 2.086682 &13.21(0.11)& 10.5(3.5)&& &$<$13.5&\\
\hline
 {\ho} & 2.158179 &$>$14.70(0.02)& 26.7(0.4)&& 2.158165 &$>$14.80(0.05)& 27.9(0.6)&II&\he\\ 
 {\cf} & 2.158093 &12.13(0.04)& 10.2(1.4)&& 2.158087 &12.52(0.03)&  9.5(1.0)\\
 {\os} & 2.158112 &13.22(0.11)&  4.6(2.9)&& 2.158139 &13.32(0.09)&  8.6(2.0)\\
\hline
 {\ho} &          &16.67(0.12)$^a$  &
       &&          &17.00(0.08)$^a$&&II&\he\\ 
 {\cf} &          &13.67(0.03)$^b$  
  &          &&          &13.92(0.03)$^b$\\
 {\os} & 2.200800 &13.00(0.20)&  4.8(3.3)&& 2.200822 &13.34(0.15)&  7.2(3.5)\\
 {\os} & 2.201069 &13.57(0.08)& 16.7(4.4)&& 2.201088 &13.44(0.15)& 12.6(5.9)\\
\hline
 {\ho} & 2.435220 &13.93(0.04)& 37.6(2.9)&&&&&I&\rx \\
 {\ho} & 2.436189 &14.86(0.02)& 36.6(1.0) \\
 {\ho} & 2.437021 &13.64(0.07)& 71.1(5.8) \\
 {\cf} & 2.437208 &12.54(0.03)& 13.9(1.2)&& 2.436724 &12.86(0.04)&  6.4(1.0)\\
 {\os} & 2.437271 &13.55(0.04)& 10.0(1.0)&& 2.437265 &13.70(0.10)& 10.6(3.7)\\
\hline
 {\ho} & 2.516735 &14.82(0.03)& 59.8(2.2)&&&&&I&\rx\\
% {\ho} & 2.516934 &14.86(0.05)& 33.7(2.0) \\
 {\ct} & 2.516871 &12.18(0.20)& 26.7(0.0) \\
 {\cf} & 2.516871 &12.67(0.14)& 26.7(5.2) \\
 {\os} & 2.516735 &13.62(0.10)& 12.8(2.7)&& & & \\
 {\ho} & 2.517045 &14.88(0.03)& 31.9(1.3)\\
% {\ho} & 2.517055 &14.71(0.07)& 47.4(1.0) \\
 {\ct} & 2.516995 &12.50(0.07)& 12.7(0.0)&&&$<$12.53 \\
{\cf} & 2.516996 &12.73(0.12)&12.7(1.6)&&2.516916 &12.92(0.06)$^b$& 17.6(2.6)\\
{\os} & 2.517045 &13.91(0.04)&16.7(1.5)&&2.516961& 14.06(0.07)$^b$& 22.8(4.2)\\
\hline
 {\ho} & 2.624316 &13.84(0.77)& 27.1(3.5)&&&&&II&\rx \\
 {\ho} & 2.624381 &14.08(0.44)& 23.8(2.1)&&&&&   & \\
 {\os} & 2.623886 &12.85(0.06)&  7.7(1.6)&& 2.623860& 13.08(0.17)&  1.9(0.9)\\
\hline
 {\ho} & 2.626526 &14.49(0.01)& 44.3(0.7)&&&&&II&\rx \\
 {\os} & 2.626749 &13.18(0.04)& 12.4(1.5)&& 2.626694& 13.18(0.14)&  9.6(4.7)\\
\hline
 {\ho} & 2.631842 &15.66(0.07)& 10.0(2.3)&&&&&I&\rx \\
 {\os} & 2.631480 &13.66(0.06)& 17.3(2.5) \\ 
 {\ho} & 2.632487 &15.98(0.06)& 21.6(3.4) \\
 {\os} & 2.631768 &13.54(0.09)&  8.9(1.2) \\
 {\os} & 2.632020 &13.83(0.05)& 12.9(1.1) \\
 {\ho} & 2.633119 &16.25(0.04)& 21.5(2.4) \\
 {\os} & 2.632495 &13.91(0.15)&47.3(13.6) \\
 {\os} & 2.632770 &14.43(0.04)& 52.5(4.0) \\
 {\ho} & 2.633998 &15.66(0.08)& 16.4(3.4) \\
 {\os} & 2.633161 &13.26(0.07)&  6.7(1.1) \\
 {\sus}& 2.633173 &12.74(0.06)&  8.5(1.5) \\
 {\os} & 2.633486 &13.03(0.16)&  7.8(2.1) \\ 
 {\os} & 2.633766 &13.40(0.05)& 10.1(1.2) \\
 {\os} &2.634119  & 13.18(0.05)& 12.7(1.6)&&    & 14.66(0.07)$^c$
&\\
 {\sif}&          &13.88(0.02)$^b$&      &&    & 14.18(0.40)$^b$
  & \\      
\hline
\end{tabular}}\smallskip
$^a$ From Lopez et~al. (1999).
$^b$ Column density integrated over all
       fitted velocity components.
$^c$ AODM value.
\end{table}