Fig. 2.
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From top to bottom: column density distributions (black) of ArH+, p-H2O+, o-H2O+, OH+, HI, HF alongside the corresponding scaled H2 profile ([HF]/[H2] = 5×10−10; Emprechtinger et al. 2012) and CO towards NGC 253 (left) and NGC 4945 (right), respectively. The corresponding uncertainties are displayed by the blue shaded region.
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