Fig. 9.

The fit quality for the LHCb data for $W$ and $Z$ production in [78] and [79] at NLO and NNLO. Note that correlated uncertainties are made available in the form of a correlation matrix, so the shift of data relative to theory cannot be shown. The plots show $\mathrm{d}\mathit{\sigma }/\mathrm{d}{\mathit{\eta }}^{\mathit{\mu }}$ versus ${\mathit{\eta }}^{\mathit{\mu }}$, and $\mathrm{d}\mathit{\sigma }/\mathrm{d}{y}_Z$ versus $y_Z$