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\usepackage{xspace}
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\begin{document}
\bgroup
\begin{tabular}{l @{\hskip 1.75em} *{3}{r@{ $\pm$ }l@{ $\pm$ }l } }
\toprule
& \multicolumn{9}{c}{ $ y$ \xspace} \\
\cmidrule(l{-0.5em}){2-10}
\mbox{$p_{\mathrm{ T}}$}\xspace [ $ {\mathrm{\,Ge\kern -0.1em V\!/}c}$ \xspace]\hskip 1.25em & \multicolumn{3}{c}{$2.0-3.0$} & \multicolumn{3}{c}{$3.0-3.5$} & \multicolumn{3}{c}{$3.5-4.5$} \\
\cmidrule[0.5pt](r{1.2em}){1-1} 
\cmidrule[0.5pt](l{-0.5em}){2-10} 
$2.5-4.7$ & $-0.59$ & $0.40$ & $0.32$ & $-0.34$ & $0.37$ & $0.13$ & $-0.45$ & $0.39$ & $0.14$ \\
$4.7-6.5$ & $-0.73$ & $0.29$ & $0.27$ & $-0.15$ & $0.31$ & $0.10$ & $-0.73$ & $0.30$ & $0.13$ \\
$6.5-8.5$ & $-0.32$ & $0.27$ & $0.06$ & $-0.49$ & $0.31$ & $0.10$ & $-0.40$ & $0.36$ & $0.17$ \\
$8.5-25.0$ & $-0.48$ & $0.17$ & $0.08$ & $-0.32$ & $0.26$ & $0.10$ & $-0.74$ & $0.39$ & $0.09$ \\
\bottomrule
\end{tabular}
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\end{document}
