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\begin{document}
    
    
    
    \begin{tabular}{c| *{2}{d{3.3}} | *{2}{d{3.3}} | *{1}{d{3.3}} | *{1}{d{3.3}}}
    \toprule[1pt]
         & \multicolumn{1}{c}{#1}{$N_{ B\xspace\xspace^0\xspace}$(Run 1)} & \multicolumn{1}{c}{#1}{$N_{ B\xspace\xspace^0\xspace}$(Run 2)} & \multicolumn{1}{c}{#1}{$N_{ B\xspace\xspace^0_ s\xspace\xspace\xspace}$(Run 1)} & \multicolumn{1}{c}{#1}{$N_{ B\xspace\xspace^0_ s\xspace\xspace\xspace}$(Run 2)} & \multicolumn{1}{c}{#1}{$k$} & \multicolumn{1}{c}{#1}{$|\phi|$}\\
         \midrule[0.5pt]
         $N_{ B\xspace\xspace^0\xspace}$(Run 1)& 1.00& 0.00& -0.29& 0.00& 0.00& 0.00\\
         $N_{ B\xspace\xspace^0\xspace}$(Run 2)& 0.00& 1.00& 0.00& -0.28& 0.01& 0.01\\
         \midrule[0.5pt]
         $N_{ B\xspace\xspace^0_ s\xspace\xspace\xspace}$(Run 1)& -0.29& 0.00& 1.00& 0.00& 0.01& 0.06\\
         $N_{ B\xspace\xspace^0_ s\xspace\xspace\xspace}$(Run 2)& 0.00& -0.28& 0.00& 1.00& 0.03& 0.06\\\hline
         $k$& 0.00& 0.01& 0.01& 0.03& 1.0& -0.26\\
         \midrule[0.5pt]
         $|\phi|$& 0.00& 0.01& 0.06& 0.06& -0.26& 1.00\\
        \bottomrule[1pt]
    \end{tabular}
\end{document}
