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Fig. 8.

Stacked and smoothed X-ray images of the ten X-ray non-detections in the full (0.5–7 keV; left), soft (0.5–2 keV; centre) and hard (2–7 keV; right). Each panel is approximately 40″ × 40″ in size. The blue solid circle with radius of 5 pixels () and dashed annulus represents the source and background extraction regions.
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