Fig. 2
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RGB images of the whole ACIS-I field (left panel) and the central area (right panel) of the composite Chandra images. Soft band (0.5–1.0 keV) photons are marked in red, medium band (1.0–2.0 keV) photons in green, and hard band (2–7.9 keV) photons in blue. The brightest source in the southeast direction is CXOU J16. The two images were smoothed adopting a Gaussian kernel with a radius of 2 pixels.
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