Invariant-mass distributions of signal candidates for the hadronic decays of $\Xi_c^+$ in $4 <   p_{\rm T} <   12$ GeV/$c$ (left), and $\Xi_c^0$ in $2 <   p_{\rm T} <   12$ 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.