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Fig. 1

image

Colour composite UV image in the Swift UVOT filters, W2 blue, M2 green and W1 red, of the pair system, NGC 3447 and NGC 3447A (white ellipses). The emission within the dashed circle corresponds to the SNa 2012th (Yamanaka et al. 2014), masked in our photometric analysis (Sect. 2.1).

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