Left: Ratio of the number of selected clusters after each applied selection with respect to basic cluster selections (see Tab. 6) as a function of the cluster momentum. The green markers indicate the use of the CPV requirement, while the red markers include the CPV and $\sigma_{\rm long}^{2}$ selection criteria. For each step, the data are represented by the points, while the lines indicate the same selection step in the simulations. Right: Inclusive photon purity $P$ and reconstruction efficiency $\varepsilon_{\gamma}$ as defined in Eqs. 30 and 31 after applying each cluster selection criterion. Both figures are done using V2 clusters as inputs.