Figure 5

Top: Comparison of the primary charged particle differential yield in INEL $pp$ collisions at $\sqrt{s}=900 $GeV ($|\eta|< 0.8$) to results from PHOJET and PYTHIA tunes 109 [12], 306 [28] and 320 [27]. Bottom: Ratio between the Monte Carlo simulation and the data. The shaded area indicates the statistical and systematic errors of the ALICE data added in quadrature.