Fig. 2
Redshift-hardness distribution of the main sample. The coloured 2D histogram shows the number of sources in a particular bin of redshift and hardness interval. The inserted curves indicate the mean value (blue solid line), median value (blue dashed line), and the ratio of the median to mode (red dot-dashed line) of the hardness per redshift bin. The side-bar histograms show the total number of sources per hardness and redshift bins, respectively.
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