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Fig. 2


Extinction map, corresponding approximately to the overlap region marked in Fig. 1, in which we identified the inter-arm regions of UGC 3995B by eye (red polygon), surrounding complex A and B in Fig. 2. The orange line shows where the transmission curve from the center of UGC 3995A to the center of UGC 3995B, shown in Fig. 3, was taken.

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