N₂H⁺J = 3−2 line (1072.56 μm) from vertical escape for the four models from top left to bottom right: the standard disk model using the set of adsorption energies from Aikawa et al. (1996; model 1), Garrod & Herbst (2006; model 5), UMIST2012 (model 6), T-dependent adsorption rates (model 7). The three panels show the optical depth in the line and the continuum, the cumulative line flux as a function of radius and the box (thick black line) in which 50% of the line flux originates (15–75% radially and vertically – dashed black lines) on the color background of the N₂H⁺ density distribution.