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Fig. E.1
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Optical and radio imaging and spectrum for the SDSS J121805.63+583904.6. From left to right, top to bottom: (a) grz cutout image from SDSS with 1′ size; (b) LoTSS DR2 cutout image with 1′ size; (c) SDSS optical spectrum from BOSS spectrograph, assuming z= 1.122 .
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