$R_{\rm AA}$ of electrons from semileptonic heavy-flavour hadron decays at mid-rapidity as a function of $p_{\rm T}$ in 0--10\% (left) and 20--40\% central (right) Pb--Pb collisions at \energy  = 2.76\,TeV compared to model calculations  with and without EPS09 shadowing parameterisations .