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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.
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