Fig. 4.

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Distribution of non-matching probabilities in the cross-match used for the candidate selection (red), a cross-match with artificially shifted positions (blue), and for the known XDINSs (green dashed) that comprise the five ROSATdetected sources on the western Galactic hemisphere and the proposed candidates 4XMM J022141.5–735632 (Rigoselli et al. 2022; Pires et al. 2022) and 2XMM J104608.7–594306 (Pires et al. 2015).
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