Figure 14

Correlation strength $b_{corr}$ at $\sqrt{s}=7$ TeV for separated $\eta$-$\varphi$ windows in different $\pt$ intervals with same $\langle \rm n_{\rm ch}\rangle$. Five $\phi_{sep}$ values are shown as a function of $\eta_{sep}$. Windows of $\delta\eta$=0.2 and $\dphi$=$\pi$/4. Top and bottom panels contain the same experimental data, lines correspond to PYTHIA6 Perugia 2011 .top) andto PHOJET (bottom)