Figure 28

Left: Centrality percentile distribution of EMCal L1 $\gamma$ triggered events (red) in comparison to the pure minimum bias distribution and minimum bias triggered events with a 10 GeV cluster in the event. Right: Trigger RF for the EMCal or DCal L1 $\gamma$ triggers in different centrality classes for Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV. Only statistical uncertainties of the trigger RF are given in the legend.