Simulated logarithmic gas temperature (grey-scale) in a vertical slice of 3D rMHD Bifrost simulations. The solid lines represent the heights at which the optical depth is unity at a wavelength of 3.2 mm (red), and 0.8 mm (green), which correspond to ALMA bands 3, 5 and 7, respectively. The orange, white and yellow lines show the average heights at which the red and blue sides of the Hα line width according to the Leenaarts et al. (2012), Molnar et al. (2019) and FWHM definitions of linewidth are formed.