Number density in Toward (top), Transverse (middle) and Away (bottom) regions at $\sqrt{s}=0.9$ TeV (left) and $\sqrt{s}=7$ TeV (right). Right and left vertical scales differ by a factor 2. Shaded area in upper plots: systematic uncertainties. Shaded areas in bottom plots: sum in quadrature of statistical and systematic uncertainties. Horizontal error bars: bin width. | ![](https://alice-publications.web.cern.ch/sites/default/files/papers/3099/numbdens_toward-89289.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/3099/numbdens_toward_0-89291.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/3099/numbdens_transv-89293.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/3099/numbdens_transv_0-89295.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/3099/numbdens_away-89297.png ) ![](https://alice-publications.web.cern.ch/sites/default/files/papers/3099/numbdens_away_0-89299.png ) |