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\begin{document}
  
	  
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      \begin{tabular}{c|lll|lll|c}
        \toprule
        Process ~ &  \multicolumn{3}{c|}{Expected $[\rm \,pb\xspace]$} &  \multicolumn{3}{c|}{Observed $[\rm \,pb\xspace]$} & ~ Significance ~\\
        \midrule
  $ W\xspace^+\xspace\!+\! b\xspace\xspace\overline  b\xspace\xspace\xspace\xspace$ \xspace ~ & ~ $0.081$&$^{+0.022}_{-0.013}$&$^{+0.040}_{-0.018}$ ~ & ~ $0.121$&$^{+0.019}_{-0.018}$&$^{+0.029}_{-0.020}$ ~ & $7.1 \sigma$\\
  $ W\xspace^-\xspace\!+\! b\xspace\xspace\overline  b\xspace\xspace\xspace\xspace$ \xspace ~ & ~ $0.056$&$^{+0.014}_{-0.010}$&$^{+0.018}_{-0.013}$ ~ & ~ $0.093$&$^{+0.018}_{-0.017}$&$^{+0.023}_{-0.016}$ ~ & $5.6 \sigma$\\
  $ W\xspace^+\xspace\!+\! c\xspace\xspace\overline  c\xspace\xspace\xspace\xspace$ \xspace ~ & ~ $0.123$&$^{+0.034}_{-0.020}$&$^{+0.060}_{-0.027}$ ~ & ~ $0.24$&$^{+0.08}_{-0.07}$&$^{+0.08}_{-0.04}$ ~ & $4.7 \sigma$ \\
  $ W\xspace^-\xspace\!+\! c\xspace\xspace\overline  c\xspace\xspace\xspace\xspace$ \xspace ~ & ~ $0.084$&$^{+0.021}_{-0.015}$&$^{+0.027}_{-0.020}$ ~ & ~ $0.133$&$^{+0.073}_{-0.062}$&$^{+0.050}_{-0.022}$ & $2.5 \sigma$\\
  $ t\xspace\xspace\overline  t\xspace\xspace\xspace$ \xspace ~ & ~ $0.045$&$^{+0.008}_{-0.007}$&$^{+0.012}_{-0.010}$ ~ & ~ $0.05$&$^{+0.02}_{-0.01}$&$^{+0.02}_{-0.01}$ ~ & $4.9 \sigma$\\
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\end{document}
