The nuclear modification factor as a function of the charged hadron multiplicity. For ALICE and STAR results, the selection $p_{\rm T}>0.15$ GeV/$c$ minimises the contribution of photoproduced J/$\psi$  . (Top) Comparison between SPS (NA50) , RHIC (STAR)  and LHC (ALICE)  results; (bottom) the ALICE results compared with theoretical calculations (SHM , Comovers , TM-TAMU , TM-Tsinghua ).