Fig. 3.
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Top: distribution of molecular gas fraction (fH2) traced by ArH+ (blue), OH+ (red) and CO (orange). Bottom: contours of X(ArH+) (blue) and X(OH+) (red) abundances with respect to NH in the fH2–ζp(H) plane. Blue triangles and red diamonds represent the corresponding values derived from the LOS observations presented in this work computed per channel in the velocity interval (Δυ ∼ 4.5 km s−1) between 55 and 295 km s−1, and 445 and 725 km s−1 for NGC 253 and NGC 4945, respectively.
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