Top panel: N-PDFs for the atomic hydrogen for different p. The PDF is measured over the entire filament indicated with a red polygon in Fig. 14, assuming a constant spin temperature of THISA = 40 K. Bottom panel: N-PDFs for the atomic hydrogen for different spin temperature and different polynomial functions fit to get Toff. The dashed vertical lines in each panel indicate the column density threshold, and the solid vertical lines indicate the mean column densities. The bottom x-axes in both panels are the relative column densities for the N-PDF of “Pol 2, p = 0.9, 40 K”, i.e., the black histogram in both panels. Other N-PDFs are shifted to the correct absolute column density for comparison.
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