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Fig. 11

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Column density maps of the models for the three sources. The lower panels show the column density (in H2 cm-2) in z-direction, the central panels in y-direction, and the upper panels in x-direction (the arrow points to the observer, who is at positive z). Two Hii regions are marked for each source. The model radiation is compared to the observations in Figs. 12 to 14.

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