Fig. 4.

Inclusive fiducial cross section $\sigma (\mathrm{W}+\mathrm{c})$ and the cross section ratio $\sigma ({\mathrm{W}}^{+}+\overline{\mathrm{c}})/\sigma ({\mathrm{W}}^{-}+\mathrm{c})$ at 13$\text{Te}$. The data are represented by a line with the statistical (total) uncertainty shown by a light (dark) shaded band. The measurements are compared to the NLO QCD prediction using several PDF sets, represented by symbols of different types. All used PDF sets are evaluated at NLO, except for ATLASepWZ16, which is obtained at NNLO. The error bars depict the total theoretical uncertainty, including the PDF and the scale variation uncertainty