Invariant-mass distributions of $\Xi\mathrm{K^{0}_{S}}$ pairs with $p_{\rm T}>2.5$ GeV/$c$ and $|y|< 0.8$ in high-multiplicity-triggered (HM) pp collisions at $\sqrt{s}=13$ TeV. (a) Same-event distribution plotted with normalized mixed-event combinatorial background. (b) Background-subtracted distribution fitted with residual background polynomial and Voigt peak. (c) Same-event distribution fitted with summed background function and Voigt peak..