Fraction of clusters with $n^{\rm w}_{\rm cell}>4$ within the range $0.1< \sigma_{\rm long}^{2}< 0.3$ per SM. Left and middle: pp $\sqrt{s}=$ 13 TeV L1 $\gamma$ triggered data. Right: Clusters (enhanced merged decay population by few %) in EMCal for pp $\sqrt{s}=$ 7 TeV minimum bias and L0 trigger data (black marker), compared to simulations with 2 jets in the final state with different photon trigger thresholds, with (red marker) and without (blue marker) cross-talk tuning.