\begin{table}%t1
  \caption {\label{qsos}Sight lines and probed redshift ranges searched for \ion{N}{v} absorption systems and number of identified intervening and associated systems.
  }
    
  \begin{tabular}{l c c c c c c}
    \hline\hline
    \noalign{\smallskip}
{\rm QSO} & $z_{{\rm em}}$ & $z_{{\rm min}}$ & $z_{{\rm max}}$ & $X$ & $\#_{{\rm inter}}$ & $\#_{{\rm asso}}$\\     
    \noalign{\smallskip}
    \hline
    \noalign{\smallskip}
 {\object{HE~0001-2340}} & 2.26 & 1.46 & 2.21 & 2.17 & 2 & 0 \\
 {\object{HE~0151-4326}} & 2.79 & 1.55 & 2.73 & 3.67 & 1 & 0 \\
 {\object{HE~0940-1050}} & 3.08 & 1.89 & 3.01 & 3.69 & 1 & 0 \\
 {\object{HE~1122-1648}} & 2.41 & 1.46 & 2.35 & 2.65 & 0 & 0 \\
 {\object{HE~1158-1843}} & 2.45 & 1.46 & 2.39 & 2.77 & 2 & 2 \\ 
 {\object{HE~1341-1020}} & 2.13 & 1.46 & 2.08 & 1.77 & 0 &\phantom{$^{{a}}$~} $2^{{a}}$ \\
 {\object{HE~1347-2457}} & 2.61 & 1.46 & 2.55 & 3.29 & 1 & 0 \\
 {\object{HE~2217-2818}} & 2.41 & 1.46 & 2.35 & 2.65 & 1 & 0 \\
 {\object{HE~2347-4342}} & 2.89 & 1.76 & 2.83 & 3.40 & 1 & 4 \\
 {\object{PKS~0237-23} } & 2.23 & 1.46 & 2.18 & 2.08 & \phantom{$^{{b}}$~}$3^{{b}}$ & 0 \\
 {\object{PKS~0329-255}} & 2.70 & 1.56 & 2.64 & 3.33 & 0 & 1 \\
 {\object{PKS~1448-232}} & 2.22 & 1.49 & 2.17 & 1.96 & 3 & 0 \\
 {\object{PKS~2126-158}} & 3.28 & 1.93 & 3.21 & 4.30 & 0 & 0 \\
 {\object{Q~0002-422}  } & 2.77 & 1.55 & 2.71 & 3.58 & 0 & 0 \\
 {\object{Q~0109-3518} } & 2.40 & 1.46 & 2.34 & 2.61 & 1 & 0 \\
 {\object{Q~0122-380}  } & 2.19 & 1.46 & 2.14 & 1.96 & 2 & 0 \\
 {\object{Q~0329-385}  } & 2.44 & 1.46 & 2.38 & 2.74 & 2 & 1 \\
 {\object{Q~0420-388}  } & 3.12 & 2.03 & 3.05 & 3.41 & 1 & 0 \\
 {\object{Q~0453-423}  } & 2.66 & 1.46 & 2.60 & 3.46 & 0 & 1 \\
    \hline
  \end{tabular}
\smallskip
  $^{{a}}$ Plus 2 associated mini-BAL systems;
  $^{{b}}$ plus 2 damped Ly$\alpha$ systems with detected \ion{N}{v}.
\end{table}