 | Expected (filled histogram) and observed (points with error bars) distributions after the combined fit under the background-only hypothesis of (a) the $\chi^2$ of the kinematical reconstruction in the signal region; (b) $p_{\rm T}$ of the leading lepton in the non-prompt lepton control region with the $b$-tagged jet veto; (c) $p_{\rm T}$ of the leading lepton in the $t\bar{t}Z$ control region; (d) the transverse mass of the $W$ boson in the $WZ$ control region. For comparison, distributions for the FCNC $t\bar{t}$ $\to$ $bWuZ$ signal (dashed line), normalized to the observed limit, are also shown. The dashed area represents the total uncertainty in the background prediction. |
 | Expected (filled histogram) and observed (points with error bars) distributions after the combined fit under the background-only hypothesis of (a) the $\chi^2$ of the kinematical reconstruction in the signal region; (b) $p_{\rm T}$ of the leading lepton in the non-prompt lepton control region with the $b$-tagged jet veto; (c) $p_{\rm T}$ of the leading lepton in the $t\bar{t}Z$ control region; (d) the transverse mass of the $W$ boson in the $WZ$ control region. For comparison, distributions for the FCNC $t\bar{t}$ $\to$ $bWuZ$ signal (dashed line), normalized to the observed limit, are also shown. The dashed area represents the total uncertainty in the background prediction. |
 | Expected (filled histogram) and observed (points with error bars) distributions after the combined fit under the background-only hypothesis of (a) the $\chi^2$ of the kinematical reconstruction in the signal region; (b) $p_{\rm T}$ of the leading lepton in the non-prompt lepton control region with the $b$-tagged jet veto; (c) $p_{\rm T}$ of the leading lepton in the $t\bar{t}Z$ control region; (d) the transverse mass of the $W$ boson in the $WZ$ control region. For comparison, distributions for the FCNC $t\bar{t}$ $\to$ $bWuZ$ signal (dashed line), normalized to the observed limit, are also shown. The dashed area represents the total uncertainty in the background prediction. |
 | Expected (filled histogram) and observed (points with error bars) distributions after the combined fit under the background-only hypothesis of (a) the $\chi^2$ of the kinematical reconstruction in the signal region; (b) $p_{\rm T}$ of the leading lepton in the non-prompt lepton control region with the $b$-tagged jet veto; (c) $p_{\rm T}$ of the leading lepton in the $t\bar{t}Z$ control region; (d) the transverse mass of the $W$ boson in the $WZ$ control region. For comparison, distributions for the FCNC $t\bar{t}$ $\to$ $bWuZ$ signal (dashed line), normalized to the observed limit, are also shown. The dashed area represents the total uncertainty in the background prediction. |