Open Access

Fig. 20


N-PDFs of the gas traced by H I (left panel) emission, HISA (middle panel), and 13CO (right panel) in units of hydrogen atoms per square cm. The light green lines show the log-normal fit in each panel. σ is the width of the log-normal distribution. The dashed vertical lines in each panel mark the column density threshold, and the solid vertical lines mark the mean column densities. The red line in the 13CO panel shows the power-law fit with an index − α to the high column density tail.

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