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Fig. 4.

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Summed UVW1 image showing the detection of TUVO-21acq during quiescence. The image was created by co-adding all archival UVW1 exposures covering the position of TUVO-21acq while the source was not in outburst (i.e. images taken during the outbursts were omitted). The total exposure time is 42 ks. The image is 150″ by 150″. North is up and east is left. The red lines indicate the position of TUVO-21acq.

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