Fig. 2

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Distribution of log() for Gaia DR3 sources. Upper panel: total number of all sources (blue histogram) and those sources identified as eRASS1 and eRASS:5 X-ray emitters (red dashed and solid histogram). Lower Panel: X-ray detection fraction vs.
-index; the dashed line indicates the boundary between the HA and VHA groups (see text for details).
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