Spectrometric redshift distribution in the QSO sample (blue slashed histogram). The distribution for the QSO passing the cut zNN > 2.1 is overplotted (red dotted histogram). After this cut, 90.0% of the QSOs with z < 2.2 are removed and only 5.3% of the QSOs in the 2.2 < z < 3.5 region are lost.
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