Column density PDFs of models #11 (b = 1/3) and #24 (b = 1), and the PDF of the Taurus molecular cloud. Both models have ℳ_s = 10 and B = 0 μG, and they are 512³ computational cells in size. The black histograms show the PDFs of model #11 at t = 0 (solid line) and SFE = 5% (dotted line). The blue line shows the PDF of model #24. The red line shows the PDF of Taurus from Kainulainen et al. (2009). The dynamic range of the Taurus PDF ends at about lnN(H₂) = 3.2. The black dashed line shows, for reference, a lognormal function. The PDFs in the range N(H₂) = 3−11 × 10²¹ cm^-2 can be described by a lognormal function, but also reasonably well by a powerlaw function (which would be a linear curve in the given presentation).