"Table 2" of "Measurement of the top-quark mass using decays with a $J/ψ$ meson at $\sqrt{s}=$13 TeV with the ATLAS detector"

Number of selected events in data after the final selection. Also shown are the expected numbers of $t\bar{t}$ and single-top-quark events, assuming a top-quark mass of $m_{top} = 172.5$ GeV, broken down into contributions with and without the $b\rightarrow J/\psi\rightarrow\mu^+\mu^-$ decay, and other background events, corresponding to the integrated luminosity of the data. The last two rows show the expected background fraction and the ratio of observed to expected events. The total uncertainty includes both statistical and systematic components, combined in quadrature.