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\begin{document}
 \begin{tabular}{|c|c|c|}
\hline
$ n_{\rm ch}$ & Prob.\ in min.\ bias  & Prob.\ in hard QCD \\
    &  events $\times 10^3$ &  events $\times 10^3$ \\ \hline
 $  1$  & $244.35\pm0.36\pm7.66$&  $126.88\pm0.38\pm6.57$  \\
 $  2$  & $191.00\pm0.33\pm4.02$&  $140.50\pm0.43\pm5.81$  \\
 $  3$  & $142.72\pm0.31\pm1.44$&  $133.83\pm0.44\pm3.91$  \\
 $  4$  & $106.75\pm0.28\pm0.10$&  $121.45\pm0.44\pm1.95$  \\
 $  5$  & $80.27\pm0.26\pm0.73$ &  $103.10\pm0.43\pm0.75$ \\
 $  6$  & $61.09\pm0.25\pm1.22$ &  $86.87\pm0.42\pm0.98$  \\
 $  7$  & $46.22\pm0.23\pm1.42$ &  $70.01\pm0.41\pm1.59$  \\
 $  8$  & $34.57\pm0.21\pm1.45$ &  $55.15\pm0.39\pm1.83$  \\
 $  9$  & $26.09\pm0.20\pm1.38$ &  $43.12\pm0.36\pm2.13$  \\
 $ 10$  & $19.30\pm0.18\pm1.34$ &  $32.71\pm0.34\pm2.20$  \\
 $ 11$  & $14.08\pm0.17\pm1.17$ &  $24.64\pm0.32\pm2.00$  \\
 $ 12$  & $10.17\pm0.16\pm1.07$ &  $18.25\pm0.29\pm1.80$  \\
 $ 13$  & $7.23\pm0.14\pm0.98$  &  $13.66\pm0.28\pm1.84$ \\
 $ 14$  & $5.43\pm0.13\pm0.82$  &  $9.97\pm0.25\pm1.52$  \\
 $ 15$  & $3.55\pm0.12\pm0.60$  &  $6.64\pm0.22\pm1.12$  \\
 $ 16$  & $2.60\pm0.11\pm0.40$  &  $4.91\pm0.21\pm0.78$  \\
 $ 17$  & $1.78\pm0.10\pm0.65$  &  $3.14\pm0.18\pm1.23$  \\
 $ 18$  & $1.35\pm0.09\pm0.28$  &  $2.45\pm0.17\pm0.47$  \\
 $ 19$  & $0.82\pm0.08\pm0.22$  &  $1.56\pm0.15\pm0.42$  \\
 $ 20$  & $0.62\pm0.07\pm0.19$  &  $1.15\pm0.13\pm0.34$  \\
\hline
\end{tabular}
\end{document}
