Figure 4

Illustrative example of forward versus backward raw multiplicity distribution for windows with $\deta=0.6$ and $\eta_{gap}=0.4$ at $\sqrt{s}=7$ TeV (left) and corresponding correlation function (right) The correlation strength $b_{corr}$ is obtained from a linear fit according to Eq. \ref{linear}. Since most of the statistics is at low multiplicities,the fit is mainly determined by the first points