Related paper Coherent $ρ^0$ photoproduction in ultra-peripheral Pb-Pb collisions at $\mathbf{\sqrt{\textit{s}_{\rm NN}}} = 2.76$ TeV Excitation function for coherent and exclusive $\rho^0$ production. The results from ALICE and STAR are compared with the STARLIGHT and GDL predictions for Pb-Pb and Au-Au.[png] [pdf]