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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