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\begin{document}
\small

\begin{tabular}{@{}l@{$\,<\,y^*<\,$}lr@{$\,\pm\,$}r@{}}
\toprule
\multicolumn{2}{c}{$y^*$ bin}  & \multicolumn{2}{c}{$R_{{\rm FB}}$} \\
\midrule
 2.5 & 3.0 & 0.80& 0.09 \\ 
3.0 & 3.5 & 0.82& 0.07 \\ 
3.5 & 4.0 & 0.79& 0.07 \\ 
\bottomrule
\end{tabular}
\end{document}
