Fig. A.1
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EPIC/pn image of GJ 643 and GJ 644 AB (ObsID 0860302501). The dashed turquoise circle is centered on the X-ray position of GJ 644 AB and its radius corresponds to the separation of GJ 643 from that bright X-ray source. The three green circles are the background regions chosen for GJ 643, the red circle represents the background region for GJ 644 AB.
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