Production cross section of electrons from W$^{-}$ decays as a function of $p_{\rm T}$ at midrapidity in pp collisions at $\sqrt{s}=$13 {\TeV} compared with POWHEG calculations  using the CT14NNLO  (left), CT18NLO  (middle) and NNPDF4.0  (right) PDF sets. The symbols are placed at the centre of the $p_{\rm T}$ interval. The statistical and systematic uncertainties of the measurement are shown as vertical lines and open boxes, respectively. The uncertainties of the theoretical calculations are shown as shaded bands. The ratio of the data to the POWHEG calculations is shown in the lower panels.