Distributions of N_H in the unabsorbed subsample (N_H  <  10²² cm⁻²). The result with the ML approach using AICc selection is shown by the solid magenta line, and the approach using M1 alone is shown by the solid orange line. The results with the Bayesian method using medians and stacked PDF are shown by the dashed blue and black lines, respectively. The gray line shows the parent distribution.