Steady-state ionization rates for the fiducial model. The total ionization rate for H₂ (ζ^(H₂); solid black line) is the sum of the following contributions: the radionuclides ionization rate for H₂ (; dashed purple line) defined by Eq. (15); the galactic cosmic ray ionization rate for H₂ (; dash-dotted blue line) defined by Eq. (14); the scattered X-ray contribution of the X-ray ionization rate for H₂ (; dotted dark orange line) defined by Eq. (13); and its direct X-ray contribution (; dotted red line) defined by Eq. (12). Panel a: Mid-plane ionization rates as a function of radius. The gray shaded area corresponds to the radial locations within the mid-plane dead zone. Panel b: ionization rates computed at r = 1 au (a radial location well within the dead zone) as a function of height, z. Panel c: same as panel b but for r = 23⁻ au, corresponding to the radial location right before the mid-plane dead zone outer edge (r = 23 au). Panel d: same as panel b but for r = 23⁺ au, corresponding to the radial location right after the mid-plane dead zone outer edge. Panel e: same as panel b but for r = 80 au, corresponding to a radial location well within the MRI-active layer. A 2D map of the total ionization rate for H₂ (ζ^(H₂)) and its different contributions can be found in Fig. C.1.