Modelled line area map (top) and residual map (bottom) for the best fit of January 2, 2011 data (Cavalié et al. 2019) with the prestorm model of Moses et al. (2015). The residual map corresponds to the difference between the observed map of Cavalié et al. (2019) (Fig. 2) and the modelled map. The contours are given in units of σ. The solid contours refer to positive residuals and the dashed contours indicate negative residuals. The overall description of the maps is the same as in Fig. 2.