Excess yield of dielectrons in the 10% most central Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV with respect to the expected ee contributions from known hadronic sources, including (Cocktail2) or not including (Cocktail1) medium effects for the heavy-flavor contributions, and compared with predictions from the model of R. Rapp (left) and from the PHSD transport approach (right).