  The dependence on centrality, or on the number of nucleon participants, of
the midrapidity density of charged particles measured in heavy-ion collisions
at the collision energy of about 20 GeV at RHIC to the highest LHC energy of 5
TeV is investigated within the recently proposed effective-energy approach.
This approach relates multihadron production in different types of collisions
by combining, under the proper scaling of the collision energy, the constituent
quark picture with Landau relativistic hydrodynamics. The measurements are
shown to be well described based on the similarity of multihadron production
process in (anti)proton-proton interactions and heavy-ion collisions driven by
the centrality-dependent effective energy of participants.
