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Fig. A.1.
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Flux-density measurements (mJy) as a function of frequency (GHz) for J1304+2938 from 0.1 to 106 GHz. The inset shows the LOFAR data, while the arrows indicate the 3σ upper limits. Data are taken at different epochs (see Table A.1). The dashed red line corresponds to a power law F ∝ να with spectral index α = −0.75.
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