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Fig. 3

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Examples of the three morphological types defined for OCs (see Sect. 4.1): cluster [DBS2003] 176 of type OC0 (top panels), cluster NGC 6823 of type OC1 (middle panels), and cluster BH 222 of type OC2 (bottom panels). The local rms noise level of the ATLASGAL emission is, respectively, 36, 46, and 29 mJy/beam. See caption of Fig. 2 for more details of the images.

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