N-PDFs of all clouds (Figs. C.1-C.4). The N-PDF used in the analysis is shown in dark grey. The extinction map used is noted in the legend, N for NICEST, pp for PPMAP by Marsh et al. (2015), and A for the extinction maps derived in Appendix A. For the N-PDFs not derived from NICEST maps, the N-PDF derived from Juvela & Montillaud (2016) is shown in light grey for comparison. The blue, red, and yellow lines show the fits of PL, LN, and LN+PL models, respectively. The transition point of the LN+PL model is shown with a vertical dotted yellow line. All fits were made above the extinction at the last closed contour, which is marked with the vertical greyline. The residuals of the fitted models are shown below the N-PDFs, and the best-fit shape is noted in the legend. The N-PDFs are ordered according to distance, as in Table 1.