Fig. 5
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Histograms show the distribution of the Euclidean distance of each point from its respective cluster centroid for the BAL (top panel) and non-BAL (bottom panel) datasets respectively. The red shaded region marks the respective threshold limits (Q3 + 1.5 × IQR; see Sect. 3.1). Quasars falling within the shaded region are identified as anomalous quasars.
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