Fig. 6
Background emissivity (K pc−1) as a function of path length (kpc) from the considered HII region to the far boundary of the Galaxy. The P19 data are shown in black and the error margin in gray. The four different toy models are shown: model 5 (green triangles), model 6 (purple dots), model 7 (yellow stars), and model 8 (blue squares).
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