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\begin{document}
  
  
    \begin{tabular}{lcc}
        \toprule[1.pt]
      \multirow{2}{*}{Source} & helicity frame &  Collins-Soper frame \\
      & average (min. -- max.) &  average (min. -- max.) \\
      \midrule[1.pt]
      Acceptance     & 0.067 (0.045 -- 0.173) & 0.044 (0.025 -- 0.185) \\
      Binning effect & 0.018 (0.001 -- 0.165) & 0.016 (0.001 -- 0.129) \\
      Simulation sample size & 0.015 (0.005 -- 0.127) & 0.015 (0.007 -- 0.170) \\
      Sideband subtraction & 0.016 (0.001 -- 0.099) & 0.029 (0.001 -- 0.183) \\
       $ b\xspace$ \xspace-hadron contamination & 0.012 (0.002 -- 0.019) & 0.006 (0.002 -- 0.029) \\
      \bottomrule[1.pt]
    \end{tabular}
  
\end{document}
