Fig. 10.

Normalized pulls and constraints of the nuisance parameters related to the modelling uncertainties for the simultaneous fit of ${\sigma }_{\mathrm{t}\overline{\mathrm{t}}}$ and $m_{\mathrm{t}}^{\mathrm{MC}}$. The markers denote the fitted value, while the inner vertical bars represent the constraint and the outer vertical bars denote the additional uncertainty as determined from pseudo-experiments. The constraint is defined as the ratio of the post-fit uncertainty to the pre-fit uncertainty of a given nuisance parameter, while the normalized pull is the difference between the post-fit and the pre-fit values of the nuisance parameter normalized to its pre-fit uncertainty. The horizontal lines at $\pm 1$ represent the pre-fit uncertainty