Invariant mass distribution of non-prompt $\Ds$ candidates and their charge conjugates in the $4<\pt<6$ $\gevc$ interval for central Pb--Pb collisions. The blue solid line shows the total fit function and the red dashed line the combinatorial-background contribution. The values of the mean ($\mu$), width ($\sigma$), and raw yield ($S$) of the signal peak are reported together with their statistical uncertainties resulting from the fit. The fraction of non-prompt candidates in the measured raw yield is reported with its statistical and systematic uncertainties.