Vertical cuts for viewing angle θ = 0° at the location shown in Fig. 3. First row: temperature, density, and line-of-sight component of the magnetic field against geometrical height. Second row: temperature, density, and line-of-sight field against optical depth. Third row: line-of-sight velocity, contribution function to H_α line intensity at Δλ = −0.11 nm from line centre, and H_α wing intensity overplotted with Dopplergram signal (dashed). The yellow contours outline the formation height of the blue H_α wing (central panel in the bottom row).