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\begin{document}
\begin{tabular}{lcccc}
\toprule
Source & 2011--2012 [\%] & 2015--2016 [\%] & 2017--2018 [\%] & Combined [\%] \\
\midrule
$f_s/f_d$ [40,41] & 5.8 & 4.9 & 4.9 & 4.6\\
\midrule
Simulated data size & 0.8 & 1.2 & 0.8 & 0.6\\
PID & 0.7 & 0.7 & 0.8 & 0.7\\
Signal model & 0.1 & 0.1 & 0.5 & 0.3\\
Background model & 1.7 & 1.3 & 0.8 & 1.1\\
\midrule
Total without $f_s/f_d$ & 2.0 & 1.9 & 1.5 & 1.5\\
Total & 6.1 & 5.3 & 5.1 & 4.8\\
\bottomrule
\end{tabular}
\end{document}
