MCMC uncertainty analysis for column density N_H, PC (top panels) and covering fraction CF (bottom panels) as a function of F_1 − 10, the unabsorbed 1−10 keV power-law best-fitting M1 (unobscured) model for XM3 (gray), and M2 (obscured) models for XM1 (magenta), and for XM4 (blue). Black crosses represent the best-fitting parameter values; dashed lines indicate the 90% confidence limits. F_1 − 10 is plotted in units of 10⁻¹² erg cm⁻² s⁻¹. N_H, PC is in units of cm⁻². XM2 is omitted for clarity, given its relatively poor model constraints. XM3 did not have a partial-covering obscurer. However, to be able to include it in these panels for the purpose of comparing F_1 − 10 to XM1 and XM4, we include XM3 here at an arbitrary limit of log(N_H, PC) < 20.9 to represent the zero value.