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Fig. 7

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Left: rosette column density PDFs on region 1 + 2 + 3 and region 4 in Fig. 5. Right: column density PDFs of the simulation of the ionization of a Mach-2 turbulent cloud. The excess at high density is still visible however the two peaks merge to form an enlarged distribution. The simulations are without self-gravity, therefore there are no power-law tails in the simulated PDFs while they are present in the observations.

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