Ratio to pQCD calculations with CT14 PDFs  of the production of muons from W$^-$ (top) and W$^+$ (bottom) decays measured as a function of rapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV by the ALICE and ATLAS  Collaborations. The ratio of EPPS16+CT14  calculations to that of CT14-only calculations is also shown. The grey band around the line at unity indicates the uncertainty on the calculations with CT14 PDFs.