Figure 6

Ratios of $\pt$-integrated particle yields $\rm K^{*0}/K^{-}$ and $\Phi/K^{-}$ as a function of $({\rm d} N_{\rm ch}/\rm d\eta)^{1/3} $ for Pb-Pb collisions at $\snn$ = 2.76 TeV and pp collisions at $\sqrt{s}$ = 7 TeV. The values of ${\rm d} N_{\rm ch}/\rm d\eta$ were measured at mid-rapidity. The statistical uncertainties are shown as bars. The shaded boxes show systematic uncertainties that are not correlated between centrality intervals, while the open boxes show the total systematic uncertainties including both correlated and uncorrelated sources. The values given by a grand-canonical thermal model with a chemical freeze-out temperature of 156 MeV are also shown \cite{Stachel_SQM2013}.