Fig. 14
Column density PDF for the whole Perseus molecular cloud: s is the slope of the power-law fit, shown in red, over the interval x1–x2, both in 1021 cm−2. As shown with the green line, the fit can be extended down to ~4 × 1021 cm−2. The brownline is a log-normal fit to the low-density PDF whose parameters are given in the text. Note that N(H2) ~ 1.6 × 1021 cm−2 is the smallest column density having a closed contour in our map.
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