Top: $\rm\Lambda/\Kzs$ ratios as a function of $\pT$ for different event centrality intervals in Pb-Pb collisions at $\snn=2.76$ TeV and pp collisions at $\sqrt{s}=0.9$ and 7 TeV.
Bottom: Selected $\rm\Lambda/\Kzs$ ratios as a function of $\pT$ compared with $\rm\Lambda/\Kzs$ and $\bar{\rm\Lambda}/\Kzs$ ratios measured in Au-Au collisions at $\snn=200$ GeV. The solid, dashed and dot-dashed lines show the corresponding ratios from a hydrodynamical model, a recombination model and the EPOS model, respectively.