Fig. 4
NH3/CCS ratio from the chemical model calculations (see Sect. 5.2) of Suzuki et al. (1992, dash-dotted line), Scappini et al. (1998, dashed line), Bergin (2000, solid line), and Aikawa et al. (2001, dotted line), and this work (10 K warm group − I model marked with open circles, 15 K group 0 model with filled circles and 25 K group I model with asterisks). The observed range of NNH3/NCCS is designated by the shaded area.
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