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Fig. 5

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Histogram of the hardness ratios split between sources classified as Galactic and extragalactic. We note that sources without a high confidence counterpart are not assigned a class in this plot. The extragalactic sources show a tail to large hardness ratio which is suggestive of a population of obscured AGN. Several of these are HBO detections with consequently high values of hardness ratio. The vertical dotted line indicates the hardness ratio expected for an absorbed power law with photon index Γ = 1.8 and Galactic column density typical of eFEDS of NH = 3 × 1020 cm−2.

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