Fig. 31.

Predictions at $\sqrt{s}=13\text{TeV}$ for the normalized distributions of the correlation observables $\mathit{\Delta }$S (left), and ${\mathit{\Delta }}^{\mathrm{rel}}{p}_{\mathrm{T}}$ (right) for four-jet production in pp collisions for the three CMS pythia8 UE tunes CUETP$8$S$1$-CTEQ$6$L1, CUETP$8$S$1$-HERAPDF1.5LO, and CUETP$8$M$1$, for CUETHppS$1$, and for CDPSTP$8$S$1$-$4$j and CDPSTP$8$S$2$-$4$j. Also shown are the ratios of the tunes to predictions of CUETP$8$S$1$-CTEQ$6$L1