Correlation strength $b_{corr}$ at $\sqrt{s}=7$ TeV for separated pseudorapidity window pairs, measured in $\pt$ intervals with same $\langle \rm n_{\rm ch}\rangle$ as a function of $\eta_{gap}$. Windows of width $\delta\eta$=0.2 Left and right panels contain same data points, lines correspond to PYTHIA6 Perugia 2011 (left) andto PHOJET (right) |