Invariant-mass distributions of signal candidates for the hadronic decays of $\Xi_{\rm c}^+$ in $4 < p_{\rm T} < 6$ GeV/$c$ (left), and $\Xi_{\rm c}^0$ in $6 < p_{\rm T} < 8$ GeV/$c$ (right), in the high-multiplicity class. The blue solid curve shows the total fit, and the red dashed curve shows the combinatorial background.