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Fig. 3


Surface density maps for all star-forming objects Hi-GAL clumps, IRAC YSOs, and intrinsically red sources from Robitaille et al. (2008) associated with the bubble sample. The spatial scales of the maps are normalized by the bubble radius (solid black circle). The dashed black circle represents the average shell radius (Rshell = 1.85 × Reff). The maps are smoothed by convolving with a Gaussian with a size of FWHM = 0.25RHII.

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