Fig. 17.

The ratio of $(1/\mathit{\sigma })\mathrm{d}\mathit{\sigma }/\mathrm{d}{\mathit{\varphi }}_{\mathit{\eta }}^{\ast }$ as predicted by various MC generators to the combined Born-level data, in three different regions of $m_{\ell \ell }$ for $|y_{\ell \ell }|<2.4$. The light-green band represents the statistical uncertainty on the data and the dark-green band represents the total uncertainty (statistical and systematic) on the data