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Fig. 2

image

Panel a: observed H2S abundance as a function of visual extinction in TMC 1-C (blue), TMC 1-CP (red), and Barnard 1b (green). In a similar fashion, panel b: observed H2S gas-phase abundance against the H number density in TMC 1 and Barnard 1b cores. Crosses represent upper bound values. Finally, panel c: the H2S abundance against the gas kinetic temperature.

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