Comparison of the non-LTE-inferred photospheric and chromospheric magnetic field (left column) with those from the magnetofrictional model (middle column) and the MHD model (right column). Top row: photospheric LOS magnetic field with azimuth arrows for the photospheric field (blue) and chromospheric field (green), colour-scaled according to the corresponding colour bars. We encourage using a PDF viewer to appreciate the photosphere-to-chromosphere changes in magnetic field azimuth. The inferred magnetic field has been taken at log τ₅₀₀ = −1.1 (from non-LTE Fe I) and log τ₅₀₀ = [ − 2.9, −4.1] (from Ca II 8542 Å) and the magnetic field map in the top left panel is identical to Fig. 5e, only including now also arrows for the chromospheric field azimuth (green). Bottom row: angle θ between the photospheric and chromospheric field vector of the inversions and models. The dashed lines (purple in the top row, white in the bottom row) indicate the photospheric LOS polarity inversion lines, while the cyan contours in the top left panel outline the Ca II flare ribbons.