Total \ccbar and \bbbar cross sections extracted from a fit of the measured dielectron yield from heavy-flavour hadron decays in \mbox{( $m_{{\rm ee}}$, $p_{{\rm T,ee}}$)} and in \dcaee with PYTHIA (left) and POWHEG (right). The results and their uncertainties (see text) are compared to published cross sections, for which the total uncertainty is represented by dashed lines.