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Fig. 1.

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Illustration of SBs in galaxy NGC 6946 from the intensity map of the THINGS survey (Walter et al. 2008). The inset in the top right corner is a zoomed-in image of a fraction of the galaxy where the locations of three SBs are shown (pink circles). A more detailed map of all the bubbles in the galaxy is shown in Brinks et al. (2007).

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