Fig. 1.

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Visibility sampling, (u, v)-coverage, of the three radio interferometric observations of J1530+1049. From left to right, these are the 1.5-GHz e-MERLIN, the 5-GHz e-MERLIN, and the 1.7-GHz EVN observations. We note that the units of the axes are 103λ for the e-MERLIN observations and 106λ for the EVN observation, where λ indicates the observing wavelength.
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