Comparison of the 160 µm and ¹³CO (6–5) radial profiles in terms of the power-law index (top) and break radius (bottom). The 27 sources whose 160 µm radial profiles were fitted with the two powerlaw model are shown as circles, and their inner power-law distributions are used for the comparison. The remaining nine sources with the single power-law distributions in 160 µm emission are indicated as triangles. Both circles and triangles are colour coded based on evolutionary stage: 70w, IRw, IRb, and HII in magenta, blue, red, and green, respectively. One-to-one relations are overlaid as dashed lines.