Fig. 6.
Top panel: histogram of the distances between the X-ray sources and their optical counterparts. Middle panel: histogram of the distances between the X-ray sources and their counterparts in IRAC ch1 (empty histogram), and IRAC ch2 (dashed histogram). Bottom panel: histogram of the distances between the X-ray sources and their counterparts in IRAC ch3 (empty histogram), and IRAC ch4 (dashed histogram).
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