$^4$He/p ratios for the measured data points as a function of charged-particle multiplicity $\langle {\rm d}N_{\rm ch}/{\rm d}\eta \rangle_{|\eta_{\rm lab}|<0.5}$ compared to model predictions. For comparison the result from the 10\% most central Pb--Pb collisions at $\sqrt{s_\mathrm{NN}} = 2.76$ TeV  and the upper limit at 90\% CL from p--Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV  is also shown. The thermal model curves are from the CSM . For the coalescence model two different approaches are displayed: analytical and UrQMD hybrid coalescence . The analytical coalescence is shown for five different substructures.