Contours of the magnetic canopy height and the turning height over the entire FOV shown in Fig. 1 (left and middle panels, respectively). In the right panel the canopy and turning heights along the dashed line of Fig. 1 (blue and red lines, respectively) are plotted. These surfaces were smoothed over 1000 km for better visualization. Overplotted are contours of the fast speed up to a height of 2000 km. For reference, the estimated HOF (based on Leenaarts et al. 2006) of ± 0.70 Å and ± 0.35 ÅHα wings are also plotted (horizontal dotted and dashed lines, respectively).