Table 5: Total column densities of ions detected in the Keck spectrum.
Ion $\log N_{\rm tot}$(this paper) $\log N_{\rm tot}$(M05) $\log N_{\rm tot}$(M07)
  ( cm-2) ( cm-2) ( cm-2)
System A $\mbox{$z_{\rm abs}$ }=2.44$
H I $15.124 \pm 0.030$    
C IV $15.270 \pm 0.105$ 15.236  
N V $14.527 \pm 0.102$    
Si IV $12.250 \pm 0.164$    
Si III (a)    
System B $\mbox{$z_{\rm abs}$ }=2.48$
H I $15.950 \pm 0.713$    
C IV $15.471\pm0.085$ $15.024\pm0.047$ $15.144\pm0.162$
C II $14.956\pm0.025$ $14.905\pm0.151$ $15.570\pm0.997$
N V $14.085\pm0.151$ $13.663\pm0.275$ $13.730\pm0.023$
O I $13.965\pm0.116$ $14.390\pm0.032$ $14.608\pm0.028$
Mg II $15.106\pm0.155$    
        (i) $13.493\pm0.062$    
Mg I $11.766 \pm 0.209$    
Al III $13.260\pm0.085$    
Al II $14.522\pm0.237$ $12.964\pm0.023$ $13.165\pm0.889$
        (ii) $12.542\pm0.113$    
Si IV(2a) $14.037\pm0.032$ $13.909\pm0.020$ $14.017\pm0.014$
Si III $16.693\pm0.279$ $14.880\pm0.470$ $15.328\pm0.301$
        (iii) $15.902\pm0.056$    
Si II(3) $14.298\pm0.084$ $15.977\pm0.471$ $15.783\pm0.354$
Fe III (b)    
Fe II(4) $13.449\pm0.064$ $13.600\pm0.030$ $13.650\pm0.010$
System C $\mbox{$z_{\rm abs}$ }= 2.54$
H I $15.659 \pm 0.270$    
C IV $13.510 \pm 0.155$ $13.440 \pm 0.110$ $13.410 \pm 0.050$
System D $\mbox{$z_{\rm abs}$ }= 2.55$
H I $16.081\pm1.756$    
C IV $15.272\pm0.967$ $14.919\pm0.200$ $16.662\pm0.060$
N V $13.191 \pm 0.105$    
Si IV(2a) $13.665\pm0.072$ $13.514\pm0.091$ $13.567\pm0.023$
System E $\mbox{$z_{\rm abs}$ }= 1.89$
C IV $14.050\pm0.024$ $14.054\pm0.163$ $14.034\pm0.074$
Si IV $\sharp$ $13.036\pm0.064$    
System J (new system) $\mbox{$z_{\rm abs}$ }= 1.93$
C IV $\ddag $ $13.727\pm0.081$    
System F $\mbox{$z_{\rm abs}$ }= 1.97$
C IV $14.618\pm0.072$ $15.840\pm3.410$ $14.505\pm0.024$
System G $\mbox{$z_{\rm abs}$ }= 2.07$
C IV $14.740\pm0.410$ $14.227\pm0.054$ $14.331\pm0.021$
Si IV(2b) $13.587\pm0.162$ $13.260\pm0.054$ $13.327\pm0.017$
System I $\mbox{$z_{\rm abs}$ }= 2.18$
C IV $13.928\pm0.023$   $14.019\pm0.072$
Si IV $12.991\pm0.032$   $12.797\pm0.015$
Si III     $12.800\pm0.022$
System K (new system) $\mbox{$z_{\rm abs}$ }= 2.26$
H I $14.850\pm0.615$    
C IV $12.827\pm0.332$    
System H $\mbox{$z_{\rm abs}$ }= 2.27$
H I $14.074\pm0.570$    
C IV $13.200\pm0.035$ $13.230\pm0.330$ $13.914\pm0.141$
Si IV $12.527\pm0.053$    
Si III $12.784\pm0.085$ $13.020\pm2.410$ $12.807\pm0.119$
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.Mg II in system B; (ii) - without blended line 4.Al II in system B; (iii) - without blended line 2.Si III in system B; (a) - but ion detected, but N measurements are unreliable due to blends; (b) - Fe III 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 Ly$\alpha $ forest region of the spectrum; $\ddag $ - blend.

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