Comparison of $\langle $d$E_{\mathrm T}/$d$\eta \rangle$/$\langle $d$N_{\mathrm{ch}}/$d$\eta \rangle$ versus $\langle N_{\mathrm{part}} \rangle$ at midrapidity in Pb-Pb collisions at ${\sqrt{s_{\mathrm {NN}}}}$ = 2.76 TeV from ALICE and in Au-Au collisions at ${\sqrt{s_{\mathrm {NN}}}}$ = 200 GeV from STAR and PHENIX.