Mean radial source density profiles as a function of distance to the central position of the H ii regions, obtained by azimuthally averaging from the surface density maps. The black solid line represents the cumulative count of the different source types (color-coded solid lines). The black dash-dotted line represents the mean radial source density profile of the intrinsically red sources from Robitaille et al. (2008). The distance is normalized by the radius of the H ii regions (dotted vertical line). The error bars show the (± 1σ) dispersion of the radial profiles. The dashed vertical line represents the HPBW (=0.125 Reff) of the smoothing gaussian used in the surface density maps.
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