Simulated spectrum absorbed by a lognormal distribution of column densities. The emission model is an APEC at T = 1 keV and solar abundances (Lodders 2003). The mock data are the sum of 100 simulated APEC absorbed by different column density values of the neutral material extracted from a lognormal distribution. The solid lines show disnht models with avg_Θ values: 23.25 (best fit) and different std_Θ 0.50 (green), 0.33 (red, best fit), 0.20 (yellow), and 0.01 (cyan). The dashed blue line show the same emission model absorbed by a single column density equal to avg_Θ = 23.25 (with best-fit kT = 1.5 keV). Residuals χ ≡ (data − model)/error and ratios data/model are shown in the central and lower panel, respectively.