Azimuthal-correlation distributions after baseline subtraction for $4 < \pt^{\rm e} < 12$ \GeVc and for different associated \pt ranges in pp collisions at $\sqrt{s} = 5.02$ TeV and p--Pb collisions at $\sqrt{s_{\rm{NN}}} = 5.02$ TeV. The statistical (systematic) uncertainties are shown as vertical lines (empty boxes). The uncertainties of the baseline are shown as solid boxes at $\Delta\varphi \sim$ -2 rad.