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\begin{document}
\scalebox{1.}{
\begin{tabular}{@{}lr@{$\,\pm\,$}r@{$\,\pm\,$}rr@{$\,\pm\,$}r@{$\,\pm\,$}r@{}}
    \toprule
$ p_{\mathrm{T}}\xspace\,\,(\mathrm{GeV}\!/c)$  & \multicolumn{3}{c}{$ p\mkern 1mu\mathrm{Pb}\xspace$}  &\multicolumn{3}{c}{$\mathrm{Pb}\mkern 1.5mu p\xspace$} \\
\midrule
                     $(\phantom{1}2,\phantom{1}4)$ &          0.75 & 0.04 & 0.05 &          0.96 & 0.06 & 0.11 \\
                     $(\phantom{1}4,\phantom{1}7)$ &          0.77 & 0.03 & 0.04 &          1.03 & 0.05 & 0.10  \\
                    $(\phantom{1}7,12)$ &          0.83 & 0.05 & 0.04 &          0.96 & 0.05 & 0.08 \\
                   $(12,20)$ &          1.01 & 0.12 & 0.07 &          1.13 & 0.12 & 0.09 \\
\midrule
                    $(\phantom{1}2,20)$ &          0.78 & 0.02 & 0.05 &          1.00 & 0.03 & 0.10 \\
\bottomrule
\end{tabular}
}
\end{document}
