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\begin{document}
  
      
      \begin{tabular}{c|c|c}
        \toprule
        Systematic source & $\sigma_{Z}$ [$\%$]& $k_\mathrm{JES}$ [$\%$] \\
        \midrule
        Heavy-flavour tagging efficiency & $16.6$ &  ~$\phantom{<}0.5$  \\
        Hardware trigger efficiency & $\phantom{1}1.9$ & ~~~-- \\
        GEC efficiency & $\phantom{1}1.7$ & ~~~-- \\
        Jet energy correction & $\phantom{1}2.7$ & ~$\phantom{<}0.3$ \\
        Jet energy resolution & $\phantom{1}1.0$ & ~$\phantom{<}0.2$  \\
        Jet identification efficiency & $\phantom{1}2.0$ & $<0.1$  \\
        Balancing-jet selection efficiency & $\phantom{1}1.8$ &  ~~~-- \\
        Signal model & $\phantom{1}2.0$ & ~$\phantom{<}0.3$  \\
        QCD model & $\phantom{1}1.1$ & $<0.1$  \\     
        Transfer functions & $\phantom{1}1.5$ & ~$\phantom{<}0.8$ \\        
        $R$ efficiencies ratio & $\phantom{1}0.3$ & $<0.1$ \\
        Fit bias & $\phantom{1}2.1$ & ~~~-- \\
        Subdominant backgrounds ($t \bar{t}$, $W \rightarrow\xspace q q'$) & $\phantom{1}1.9$ & $<0.1$ \\     
        Final-state radiation & $\phantom{1}0.9$ &  ~~~-- \\               
        $f_{Z \rightarrow\xspace c \bar{c}}$ fraction & $\phantom{1}0.1$ &  ~~~-- \\        
        Luminosity & $\phantom{1}1.2$ &  ~~~-- \\        
        \midrule
        Total & $17.7$ & $~\phantom{<}1.1$  \\ 
        \bottomrule
      \end{tabular}
  
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