Upper panel: distributions of the soft-excess relative strength measured by the powerlaw + blackbody model (blue) and the double-powerlaw model (orange), respectively, for the AGN with good redshifts and at least 20 net counts. The values are clipped at a lower limit of 10⁻⁶. The blue filled histograms indicate an unobscured subsample with the N_H measured by the powerlaw + blackbody model below 10^20.5 cm⁻². Lower panel: ratio between the slopes of the primary power-law measured by the two models for the unobscured subsample as a function of the blackbody relative strength. The green horizontal line indicates the median value (1.04) of the ratio.