J/$\psi$ coherent photoproduction cross section ratio for two different energies ($\sqrt{s_{\rm NN}}$ = 5.02 TeV over $\sqrt{s_{\rm NN}}$ = 2.76 TeV) as a function of centrality. The data at $\sqrt{s_{\rm NN}}$ = 2.76 TeV are taken from Ref. [25]. The vertical lines are the statistical uncertainties while the open (filled) boxes are the centrality uncorrelated (correlated) systematic uncertainties. Results are compared with theoretical calculations from Ref. [33] (GG-hs), Ref. [32] (IIM and GBW) and from Ref. [35] with updated Glauber calculations from Ref. [56] (VDM).