Vertical cut along the blue vertical lines shown in Fig. 1. Vertical cuts in temperature, density, magnetic field strength, and vertical velocity are shown from top to bottom. The black line in all panels shows the τ = 1 at the nominal position of the Hα line center. Green and red contours mark τ = 1 levels at wavelength positions that correspond to Doppler shifts of Δv = −36 km s⁻¹ and Δv = 36 km s⁻¹, respectively.