Summary of the systematic uncertainties of the measured dielectron yields for $0.2 < p_{\rm T,e} < 10$ GeV/$c$ and $|\eta_{\rm e}| < 0.8$ as a function of $m_{\rm ee}$ in two different $p_{\rm {T,ee}}$ intervals 0-1 GeV/$c$ (left panel) and 1-8 GeV/$c$ (right panel) for the 10% most central Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV.