 | $\Dsone/\Ds$ (left) and $\Dstwo/\Ds$ (right) ratio times BR as a function of the average charged-particle multiplicity \avdndeta in pp collisions at $\s= 13~\TeV$ at midrapidity ($|y| < 0.5$). The experimental results are compared with the theoretical predictions based on the SHM~\cite{He:2019tik}, the SHMc~\cite{Andronic:2021erx}, PYTHIA~8~\cite{Sjostrand:2006za, SJOSTRAND2015159}, and EPOS4HQ~\cite{Zhao:2023ucp}. The statistical and systematic uncertainties on the measured ratios are depicted as vertical lines and boxes, respectively. The theoretical uncertainty on the predicted ratios is depicted as a shaded band for the \Dsone. |