$\mathrm{D_s^+/D^+}$ production yield ratio measured in pp collisions at midrapidity $(\lvert y\rvert<0.5)$ at $\sqrt{s}=13.6$ TeV as a function of the charged-particle multiplicity per unity of pseudorapidity ($\langle\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta\rangle$)  and $\pt$ compared to measurements from the LHCb Collaboration in  $\mathrm{p-Pb}$ collisions at $\sqrt{s_\mathrm{NN}}=8.16$ TeV in the forward-rapidity regions  $-4.3<y<-2.8$ and $1.8<y<3.3$. The results obtained by the ALICE Collaboration in $\mathrm{Pb-Pb}$ collisions at $\sqrt{s_\mathrm{NN}}=5.02$ TeV are also reported.

Note that the x-axis refers to different quantities for the ALICE and LHCb measurements. For the former, it refers to the midrapidity charged-particle multiplicity, while in the latter it refers to the forward rapidity charged-particle multiplicity, as defined in the regions reported in the figure.