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Fig. 7.

image

Contamination of KDEBLLACS. Left: main contaminants of KDEBLLACS are normal galaxies and QSOs, both located at the edges of the sample. Right: PDF of the γ-ray BZBs available in 4FGL obtained with a KDE. We can see that the majority of BZBs are indeed located outside of the two contaminated zones. The solid lines represent the KDE isodensity contours, while the dashed lines represents the 68% isodensity contour.

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