\begin{table}%t5
\caption{Total column densities of ions detected in the Keck spectrum.
\label{tab:logNtot}} 
%\centerline
 {\begin{tabular}{lccc}
\hline\hline
Ion & $\log N_{\rm tot}$(this paper)& $\log N_{\rm tot}$(M05)& $\log N_{\rm tot}$(M07)\\
 & (\cmsq)     & (\cmsq)   & (\cmsq) \\
\hline
\multicolumn{4}{c}{System A $\zabs = 2.44$} \\
\HI & $15.124 \pm 0.030$ & & \\
\CIV & $15.270 \pm 0.105$ & 15.236 & \\
\NV & $14.527 \pm 0.102$ & & \\
\SiIV & $12.250 \pm 0.164$ & & \\
\SiIII& (a) & & \\
\hline
\multicolumn{4}{c}{System B $\zabs = 2.48$} \\
\HI & $15.950 \pm 0.713$ & & \\
\CIV & $15.471\pm0.085$ & $15.024\pm0.047$ & $15.144\pm0.162$ \\
\CII & $14.956\pm0.025$ & $14.905\pm0.151$ & $15.570\pm0.997$ \\
\NV & $14.085\pm0.151$ & $13.663\pm0.275$ & $13.730\pm0.023$ \\
\OI & $13.965\pm0.116$ & $14.390\pm0.032$ & $14.608\pm0.028$ \\
\MgII & $15.106\pm0.155$ & & \\
~~~~~~~~($i$)& $13.493\pm0.062$ & & \\
\MgI & $11.766 \pm 0.209$ & & \\
\AlIII& $13.260\pm0.085$ & & \\
\AlII & $14.522\pm0.237$ & $12.964\pm0.023$ & $13.165\pm0.889$ \\
~~~~~~~~($ii$)& $12.542\pm0.113$ & & \\
\SiIV (2a)& $14.037\pm0.032$ & $13.909\pm0.020$ & $14.017\pm0.014$ \\
\SiIII& $16.693\pm0.279$ & $14.880\pm0.470$ & $15.328\pm0.301$ \\
~~~~~~~~($iii$)&$15.902\pm0.056$ & & \\
\SiII (3)&$14.298\pm0.084$ & $15.977\pm0.471$ & $15.783\pm0.354$ \\
\FeIII& (b) & & \\  
\FeII (4)& $13.449\pm0.064$ & $13.600\pm0.030$& $13.650\pm0.010$ \\
\hline
\multicolumn{4}{c}{System C $\zabs = 2.54$} \\
\HI & $15.659 \pm 0.270$ & & \\
\CIV & $13.510 \pm 0.155$ & $13.440 \pm 0.110$ & 
$13.410 \pm 0.050$ \\
\hline
\multicolumn{4}{c}{System D $\zabs = 2.55$} \\
\HI & $16.081\pm1.756$ & & \\
\CIV & $15.272\pm0.967$ & $14.919\pm0.200$ & $16.662\pm0.060$ \\
\NV & $13.191 \pm 0.105$ & & \\
\SiIV (2a)& $13.665\pm0.072$ & $13.514\pm0.091$ & $13.567\pm0.023$ \\
\hline 
\multicolumn{4}{c}{System E $\zabs = 1.89$} \\
\CIV & $14.050\pm0.024$ & $14.054\pm0.163$ & $14.034\pm0.074$ \\
\SiIV\ \sh & $13.036\pm0.064$ & & \\
\hline
\multicolumn{4}{c}{System J (new system) $\zabs = 1.93$} \\
\CIV\ $\ddag$ & $13.727\pm0.081$ & & \\
\hline
\multicolumn{4}{c}{System F $\zabs = 1.97$} \\
\CIV & $14.618\pm0.072$ & $15.840\pm3.410$ & $14.505\pm0.024$ \\
\hline
\multicolumn{4}{c}{System G $\zabs = 2.07$} \\
\CIV & $14.740\pm0.410$ & $14.227\pm0.054$ & $14.331\pm0.021$ \\
\SiIV (2b)& $13.587\pm0.162$ & $13.260\pm0.054$ & $13.327\pm0.017$ \\
\hline
\multicolumn{4}{c}{System I $\zabs = 2.18$} \\
\CIV & $13.928\pm0.023$ & & $14.019\pm0.072$ \\
\SiIV & $12.991\pm0.032$ & & $12.797\pm0.015$ \\
\SiIII& & & $12.800\pm0.022$ \\
\hline
\multicolumn{4}{c}{System K (new system) $\zabs = 2.26$} \\
\HI & $14.850\pm0.615$	& & \\
\CIV & $12.827\pm0.332$ & & \\
\hline
\multicolumn{4}{c}{System H $\zabs = 2.27$} \\
\HI &	$14.074\pm0.570$ & & \\
\CIV & $13.200\pm0.035$ & $13.230\pm0.330$ & $13.914\pm0.141$ \\
\SiIV & $12.527\pm0.053$ & & \\
\SiIII& $12.784\pm0.085$ & $13.020\pm2.410$ & $12.807\pm0.119$ \\
\hline
\end{tabular}}
\par
\smallskip
M05 data taken from their Tables 1 and 2 (second
spectrum in both cases). M07 data taken from their Table 3. 
The symbols denote: 
($i$) -- without blended line 4.\MgII\ in system B;  
($ii$) -- without blended line 4.\AlII\ in system B; 
($iii$) -- without blended line 2.\SiIII\ in system B; 
(a) -- but ion detected, but $N$ measurements are unreliable due to blends; 
(b) -- \FeIII\ in System~B are detected in the MMT spectrum, but
noise is too strong in order to fit this line in the Keck spectrum. 
$\sharp$ -- heavy-element line in \Lya\ forest region of the spectrum; 
$\ddag$ -- blend.
\end{table}