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Fig. 6.

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Stacked PDFs of sources with true NH in a single NH bin in four different redshift subsamples (top four panels) and in four S/N subsamples (bottom four panels). The orange area shows the true NH (amplitude fixed to 1 for clarity), and the black line shows the stacked PDF. We note that sources with negative S/N are formally detected by ewavelet, since the background is estimated differently. All distributions are normalized to unit area.

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