Column density map and respective PDF for a diffuse cloud (Polaris), a star formation poor cloud (Oph North), and a star forming rich cloud (Oph streamers). The red line on the map and on the PDF corresponds to the last closed contour while the gray line corresponds to the peak of the PDF. The blue line represents the slope of the distribution above the completeness limit. All maps cover about the same physical area of about 200 pc2.
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