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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$  & $257.54\pm0.36\pm8.38$ &  $128.89\pm0.38\pm7.33$  \\
 $  2$  & $199.12\pm0.33\pm4.08$ &  $145.79\pm0.41\pm6.39$  \\
 $  3$  & $147.50\pm0.30\pm1.23$ &  $145.41\pm0.43\pm4.13$  \\
 $  4$  & $108.21\pm0.27\pm0.31$ &  $130.01\pm0.42\pm2.16$  \\
 $  5$  & $79.83\pm0.24\pm1.10$  &  $109.73\pm0.41\pm0.44$ \\
 $  6$  & $58.83\pm0.22\pm1.50$  &  $87.48\pm0.38\pm1.58$  \\
 $  7$  & $43.25\pm0.20\pm1.67$  &  $67.91\pm0.35\pm2.16$  \\
 $  8$  & $31.48\pm0.18\pm1.64$  &  $52.94\pm0.32\pm2.50$  \\
 $  9$  & $22.72\pm0.16\pm1.48$  &  $38.50\pm0.29\pm2.43$  \\
 $ 10$  & $16.12\pm0.14\pm1.28$  &  $28.21\pm0.26\pm2.21$  \\
 $ 11$  & $11.37\pm0.13\pm1.19$  &  $20.63\pm0.24\pm2.17$  \\
 $ 12$  & $7.89\pm0.11\pm1.07$   &  $14.74\pm0.21\pm1.83$ \\
 $ 13$  & $5.63\pm0.10\pm0.81$   &  $10.02\pm0.18\pm1.45$ \\
 $ 14$  & $3.54\pm0.08\pm0.67$   &  $7.00\pm0.16\pm1.02$  \\
 $ 15$  & $2.53\pm0.07\pm0.71$   &  $4.49\pm0.13\pm1.37$  \\
 $ 16$  & $1.79\pm0.06\pm0.38$   &  $3.33\pm0.12\pm0.64$  \\
 $ 17$  & $1.07\pm0.06\pm0.29$   &  $1.96\pm0.10\pm0.53$  \\
 $ 18$  & $0.75\pm0.05\pm0.17$   &  $1.38\pm0.09\pm0.32$  \\
 $ 19$  & $0.49\pm0.04\pm0.22$   &  $0.94\pm0.08\pm0.43$  \\
 $ 20$  & $0.35\pm0.04\pm0.10$   &  $0.65\pm0.07\pm0.17$  \\
\hline
\end{tabular}
\end{document}
