Fig. 7.
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Images from HST/WFC3 of the corrected positions of X-1 in three simultaneous filters (H1, H2 and H3, upper panel) and two simultaneous filters (H4 and H5, lower panel). The images have a size of 1″ × 1″. The red dashed circle shows the astrometric error radii (0
3). Green circles represent the positions of the optical counterpart candidates c1 and c2. North is up.
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