# Figure 2

 The $p_{\rm T}$-differential invariant yields of electrons from semileptonic heavy-flavour hadron decays measured at mid-rapidity in 0--10\% and 20--40\% central Pb--Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$~TeV. Statistical uncertainties are smaller than the symbol size and the systematic uncertainties are shown as boxes.