Left panel: measured nuclear modification factor of single electrons from heavy-flavor hadron decays , as well as its parameterization and the estimated nuclear modification factor caused by pure cold-nuclear matter effects with EPS09 nPDFs, in the 10\% most central Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV. Right panel: resulting nuclear modification factor of \ee pairs from correlated open heavy-flavor hadron decays computed with a toy MC (see text) for two different $p_{\rm {T,ee}}$.