Figure 2

Ratios of kaons to pions, protons to pions, and $\Lambda$s to K$^0_{\rm S}$ as a function of $\pt$ in two multiplicity bins measured in the rapidity interval $0< y_{\rm cms}< 0.5$ (left panels). The ratios are compared to results in Pb-Pb collisions measured at midrapidity, shown in the right panels. The empty boxes show the total systematic uncertainty; the shaded boxes indicate the contribution uncorrelated across multiplicity bins (not estimated in Pb-Pb).