Predicted ionization profiles of an accretion disk illuminated by a lamppost X-ray source located at different heights above the central source. We applied Eq. (1) from Ballantyne (2017) for the curve generation. We assumed η = 0.2, α = 0.3, λ = 0.2, and f = 0.45, and set the (R_R, R_z, R_T) factors at r < 11 R_g to their values at r = 11 R_g to avoid an unphysical break in ξ(r, h). In the plot, the predicted ionization curves are compared with the ionization parameter measured from the observations in the hard spectral state in Ludlam et al. (2017) (L), Wang et al. (2017) (W), Mondal et al. (2021) (M), and this work (X1+X6), respectively.