Fig. 2
CH+ abundance structure in the HD 100546 disc with respect to the number of H-nuclei. The H2 abundance relative to total H-nuclei abundance contours in log-scale are overplotted in blue, while the Tgas = 300 and 3000 K contours are overplotted in white. The line-of-sight CH+ observations in the UV would cross the disc at z/r = 0.9 (42°).
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