Comparison of $\langle $d$E_{\mathrm T}/$d$\eta \rangle / \langle N_{\mathrm{part}}/2 \rangle$ at midrapidity versus ${\sqrt{s_{\mathrm {NN}}}}$ in 0-5% central Pb-Pb collisions at ${\sqrt{s_{\mathrm {NN}}}}$ = 2.76 TeV from ALICE and CMS and central collisions at other energies at midrapidity. All measurements are from 0-5% central collisions except the NA49 data, which are from 0-7% collisions.