remaining model dependence is extracted and quoted separately, considering a wide range of alternative Higgs boson models, as described in Section \[sec:SystematicsPAS\]. The fraction of signal events within the fiducial phase space $\mathcal{A}_\text{fid}$, and the reconstruction efficiency $\epsilon$ for signal events within the fiducial phase space for individual SM production modes and exotic signal models are listed in Table \[tab:Accept\_Eff\_fOut\].

It should be noted that the cross section is measured for the process of resonant production of four leptons via the ${\ensuremath{\PH \to 4\ell}\xspace}$ decays. This definition excludes events where at least one reconstructed lepton originates from associated vector bosons or jets, and not from the ${\ensuremath{\PH \to 4\ell}\xspace}$ decays. Those events present a broad $m_{4\ell}$ distribution, whose exact shape depends on the production mode, and are treated as a combinatorial signal-induced background in the measurement procedure. This approach provides a simple measurement procedure with a substantially reduced signal model dependence. More details are discussed in Section \[sec:Methodology\].

In the case of the independent measurement of the ${\ensuremath{\PZ \to 4\ell}\xspace}$ fiducial cross section, the fiducial phase space is defined in the analogous way, with the difference that the invariant mass of the $4\ell$ candidate for the $\PZ$ boson must satisfy 