Azimuthal-correlation distribution of electrons from heavy-flavor hadron decays and charged particles measured in 30--50\% central Pb--Pb collisions before background subtraction. The distributions are shown in the trigger range of $4 p_\mathrm{T}^\mathrm{e} 12$ \gevc and all $p_\mathrm{T}^\mathrm{assoc}$ intervals, where $1 - 2$, $2 - 3$, and $5 - 7$ GeV/$c$ are shown in Fig. \ref{fig:DeltaPhiPbPb}.