Linear dependence between $N_{\rm uncorrelated\ seeds}$ and $N_{\rm MPI}$ in PYTHIA6 Perugia-0 simulations on generator level.
Top panel: $N_{\rm uncorrelated\ seeds}$ versus $N_{\rm MPI}$ for different $|\eta|$-ranges.
Bottom panel: $N_{\rm uncorrelated\ seeds}$ versus $N_{\rm MPI}$ for different $\pT$-trig thresholds.