Fig. 3.

Event yields against $m_{Z12}=(m_{{\mathrm{Z}}_1}+m_{{\mathrm{Z}}_2})/2$ with the $\mathrm{X}\mathrm{X}$ selection for the 4$\mu$, 2e2$\mu$, and 4e final states. Numbers in the legend show the total event yields with the $\mathrm{X}\mathrm{X}$ selection corresponding to data, and the expected yields for each background and signal processes, along with the corresponding statistical uncertainty coming from the amount of simulated data