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\usepackage{lineno}
\usepackage{xspace}
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\usepackage{colortbl}
\usepackage{amsmath}
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\usepackage{mciteplus}
\usepackage{longtable}

\begin{document}
  
    
    
  
  \begin{tabular}{l|r@{$\pm$}lr@{$\pm$}lr@{$\pm$}l} &
\multicolumn{2}{c}{Magnet up} & \multicolumn{2}{c}{Magnet down} & \multicolumn{2}{c}{Mean} \\
\hline
     $ A_{\rm raw}( K\xspace\xspace^-\xspace K\xspace\xspace^+\xspace)$ \xspace     & $-0.39$&$0.23$ & $-0.20$&$0.19$ & $-0.29$&$0.15$ \\
     $ A_{\rm raw}(\pi\xspace\xspace^-\xspace\pi\xspace\xspace^+\xspace)$ \xspace   & $-1.25$&$0.40$ & $-0.29$&$0.34$ & $-0.77$&$0.26$ \\
    \hline
     $\Delta A_{ C\!P\xspace}\xspace$ \xspace &  $0.86$&$0.46$ &  $0.09$&$0.39$ &  $0.48$&$0.30$ \\
  \end{tabular} 
\end{document}
