The $N_{\rm ch}$ dependence of the mean (left panel) and standard deviation (right panel) of the $\pt$ distributions for (particle-composition corrected) Monte Carlo events in pp, p$-$Pb and Pb$-$Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. Results propagated through a full GEANT model of ALICE and corrected with the sequential 2D unfolding (closed circles) procedure described in the text are compared with the generator-level (open squares) distributions and their ratios are shown in the bottom panels.