Invariant mass distribution of cluster pairs in pp collisions at $\sqrt{s}=13$ TeV for different intervals of pair energy. The differently colored lines correspond to different clusterizer types, using the same aggregation $E_\mathrm{agg}=100$ MeV and seed $E_\mathrm{seed} = 500$ MeV thresholds. The lowest bin in energy uses the data sample with minimum bias trigger, while the others are obtained from the EMCal L1 triggered data with thresholds at about $E \approx 4$ and $9$ GeV, respectively.