Fig. 9.

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Stacked images of the extreme-AGBs from Riebel et al. (2012) and residuals after Gaussian source extraction. The field of view corresponds approximately to 70″ × 70″. Ten out of 1352 sources were excluded (see text), because the emission in their field is dominated by bright large-scale structures or because they are another type of stellar objects (e.g. YSOs).
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