The $\pt$-differential production yield of non-prompt $\Ds$ mesons divided by those of prompt $\Ds$ mesons (left panel) and non-prompt $\Dzero$ mesons (right panel) for the 0--10\% and 30--50\% centrality intervals in Pb--Pb collisions at $\sqrtsNN=5.02 \TeV$ from Refs.  compared with those in pp collisions at the same centre-of-mass energy from Ref. .