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Fig. 4.
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ATCA radio image of 4U 1556–60 at the combined frequency of 7.25 GHz. The black circle is centered on the Gaia optical counterpart for visual reference. The contours plotted are 3σ and 10σ, where σ is the background RMS value of 3.5 μJy. The bright source in the lower left corner has a peak flux density of 174 μJy (∼50σ).
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