\dNdetape\ in \PbPb\ collisions , \pPb\ collisions  and \pp\ collisions  at \sqrtSnn = 5.02 TeV, \XeXe\ collisions at \sqrtSnn = 5.44 TeV  scaled by a factor of 0.98, Au-Au and Cu-Cu collisions at \sqrtSnn = 0.2 TeV  scaled by 2.55 as a function of \avNpart. PYTHIA 8.3 calculations  for $N_{\rm ch}-$selection are shown as black lines, dotted lines are $N_{\rm part}-$selected calculations.